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\newcommand{\titre}{Le car de ramassage}
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    \small Un car de ramassage doit s'arrêter à chaque carrefour d'un quartier, une fois et une seule. Selon le plan c'est possible ou non — et un simple coloriage permet souvent de le dire d'avance, sans essayer.
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\end{center}
\noindent \textbf{Le car part de l'école, au carrefour E, et doit s'arrêter à chaque carrefour exactement une fois.} Il emprunte les rues qu'il veut et n'a pas à toutes les parcourir.\par\addvspace{0.35em}
\begin{center}
\renewcommand{\arraystretch}{1.35}
\begin{tabular}{|c|c|c|c|}
\hline
\cellcolor{black!32}\bfseries Les rues & ⑨ chemin Creux & \cellcolor{black!32}\bfseries Les carrefours & Ⓘ Rond-point de la Poste \\ \hline
① rue Pasteur & ⑩ rue des Écoles & Ⓐ Carrefour de la Mairie & Ⓙ Place du Vieux-Puits \\ \hline
② quai aux Fleurs & ⑪ sentier des Prés & Ⓑ Carrefour du Moulin & Ⓚ Rond-point des Vaches \\ \hline
③ chemin du Lavoir & ⑫ rue des Jardins & Ⓒ Place de l'Église & Ⓛ Place du Marché \\ \hline
④ venelle du Chat & ⑬ rue Verte & Ⓓ Place des Tanneurs & \cellcolor{black!32}\bfseries Les bâtiments \\ \hline
⑤ rue du Moulin & ⑭ rue Basse & Ⓔ Carrefour du Lavoir & \textbf{a} l'école \\ \hline
⑥ rue des Lilas & ⑮ rue du Puits & Ⓕ Carrefour Saint-Roch & \textbf{b} le stade \\ \hline
⑦ chemin des Vignes & ⑯ allée des Peupliers & Ⓖ Carrefour des Tilleuls & \textbf{c} la salle des fêtes \\ \hline
⑧ rue du Four & ⑰ rue Haute & Ⓗ Rond-point de la Gare & \textbf{d} la gendarmerie \\ \hline
\end{tabular}
\end{center}
\noindent{\small\itshape Légende du plan}\par\addvspace{0.4em}
\begin{enumerate}
  \item Colorier les carrefours du plan avec \textbf{deux couleurs}, de sorte que deux carrefours \textbf{reliés par une rue} ne soient jamais de la même couleur. Combien y en a-t-il de chaque couleur ?
  \item Le car roule d'un carrefour au suivant. Que peut-on dire de la \textbf{couleur} des arrêts successifs ? Qu'en déduire sur les couleurs des arrêts d'une tournée qui les dessert tous ?
  \item \textbf{Le car peut-il desservir tous les carrefours, une fois chacun, et revenir à l'école ?} Si oui, décrire un trajet ; sinon, démontrer que c'est impossible.
  \item \textbf{Et s'il n'est pas obligé de revenir à l'école ?} Même consigne.
\end{enumerate}
\newpage
\section*{\textcolor{red}{Correction}}
\needspace{5\baselineskip}
\subsection*{\textcolor{red}{Le car de ramassage — Correction}}
\needspace{3\baselineskip}
\begin{center}
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\filldraw[fill=white, draw=black, line width=0.5pt] (4.998,8.477) -- (4.969,8.62) -- (4.888,8.741) -- (4.767,8.822) -- (4.624,8.85) -- (4.482,8.822) -- (4.36,8.741) -- (4.28,8.62) -- (4.251,8.477) -- (4.28,8.334) -- (4.36,8.213) -- (4.482,8.132) -- (4.624,8.104) -- (4.767,8.132) -- (4.888,8.213) -- (4.969,8.334) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (8.099,8.116) -- (8.07,8.259) -- (7.989,8.38) -- (7.868,8.461) -- (7.725,8.489) -- (7.583,8.461) -- (7.462,8.38) -- (7.381,8.259) -- (7.352,8.116) -- (7.381,7.973) -- (7.462,7.852) -- (7.583,7.771) -- (7.725,7.743) -- (7.868,7.771) -- (7.989,7.852) -- (8.07,7.973) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (11.904,7.715) -- (11.876,7.858) -- (11.795,7.979) -- (11.674,8.06) -- (11.531,8.088) -- (11.388,8.06) -- (11.267,7.979) -- (11.186,7.858) -- (11.158,7.715) -- (11.186,7.572) -- (11.267,7.451) -- (11.388,7.37) -- (11.531,7.342) -- (11.674,7.37) -- (11.795,7.451) -- (11.876,7.572) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (1.922,7.582) -- (1.893,7.725) -- (1.812,7.846) -- (1.691,7.927) -- (1.548,7.956) -- (1.406,7.927) -- (1.284,7.846) -- (1.204,7.725) -- (1.175,7.582) -- (1.204,7.44) -- (1.284,7.319) -- (1.406,7.238) -- (1.548,7.209) -- (1.691,7.238) -- (1.812,7.319) -- (1.893,7.44) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (8.742,5.254) -- (8.714,5.397) -- (8.633,5.518) -- (8.512,5.599) -- (8.369,5.627) -- (8.226,5.599) -- (8.105,5.518) -- (8.024,5.397) -- (7.996,5.254) -- (8.024,5.111) -- (8.105,4.99) -- (8.226,4.909) -- (8.369,4.881) -- (8.512,4.909) -- (8.633,4.99) -- (8.714,5.111) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (1.904,5.113) -- (1.876,5.256) -- (1.795,5.377) -- (1.674,5.458) -- (1.531,5.486) -- (1.388,5.458) -- (1.267,5.377) -- (1.186,5.256) -- (1.158,5.113) -- (1.186,4.97) -- (1.267,4.849) -- (1.388,4.768) -- (1.531,4.74) -- (1.674,4.768) -- (1.795,4.849) -- (1.876,4.97) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (4.971,4.927) -- (4.943,5.07) -- (4.862,5.191) -- (4.741,5.272) -- (4.598,5.3) -- (4.455,5.272) -- (4.334,5.191) -- (4.253,5.07) -- (4.225,4.927) -- (4.253,4.784) -- (4.334,4.663) -- (4.455,4.582) -- (4.598,4.554) -- (4.741,4.582) -- (4.862,4.663) -- (4.943,4.784) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (11.416,4.807) -- (11.388,4.95) -- (11.307,5.071) -- (11.186,5.152) -- (11.043,5.18) -- (10.9,5.152) -- (10.779,5.071) -- (10.698,4.95) -- (10.67,4.807) -- (10.698,4.664) -- (10.779,4.543) -- (10.9,4.462) -- (11.043,4.434) -- (11.186,4.462) -- (11.307,4.543) -- (11.388,4.664) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (5.118,1.974) -- (5.089,2.117) -- (5.008,2.238) -- (4.887,2.319) -- (4.745,2.347) -- (4.602,2.319) -- (4.481,2.238) -- (4.4,2.117) -- (4.371,1.974) -- (4.4,1.831) -- (4.481,1.71) -- (4.602,1.629) -- (4.745,1.601) -- (4.887,1.629) -- (5.008,1.71) -- (5.089,1.831) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (11.332,1.913) -- (11.303,2.056) -- (11.222,2.177) -- (11.101,2.258) -- (10.958,2.286) -- (10.816,2.258) -- (10.695,2.177) -- (10.614,2.056) -- (10.585,1.913) -- (10.614,1.77) -- (10.695,1.649) -- (10.816,1.568) -- (10.958,1.54) -- (11.101,1.568) -- (11.222,1.649) -- (11.303,1.77) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (8.501,1.653) -- (8.473,1.796) -- (8.392,1.917) -- (8.271,1.998) -- (8.128,2.026) -- (7.985,1.998) -- (7.864,1.917) -- (7.783,1.796) -- (7.754,1.653) -- (7.783,1.51) -- (7.864,1.389) -- (7.985,1.308) -- (8.128,1.28) -- (8.271,1.308) -- (8.392,1.389) -- (8.473,1.51) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (1.978,1.323) -- (1.95,1.466) -- (1.869,1.587) -- (1.748,1.667) -- (1.605,1.696) -- (1.462,1.667) -- (1.341,1.587) -- (1.26,1.466) -- (1.232,1.323) -- (1.26,1.18) -- (1.341,1.059) -- (1.462,0.978) -- (1.605,0.949) -- (1.748,0.978) -- (1.869,1.059) -- (1.95,1.18) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (6.204,8.166) -- (6.323,8.185) -- (6.43,8.24) -- (6.516,8.325) -- (6.57,8.432) -- (6.589,8.551) -- (6.57,8.67) -- (6.516,8.777) -- (6.43,8.862) -- (6.323,8.916) -- (6.204,8.935) -- (6.204,8.935) -- (6.086,8.916) -- (5.978,8.862) -- (5.893,8.777) -- (5.839,8.67) -- (5.82,8.551) -- (5.839,8.432) -- (5.893,8.325) -- (5.978,8.24) -- (6.086,8.185) -- (6.204,8.166) -- cycle;
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\filldraw[fill=white, draw=black, line width=0.5pt] (5.142,6.314) -- (5.261,6.333) -- (5.368,6.387) -- (5.453,6.472) -- (5.508,6.579) -- (5.527,6.698) -- (5.508,6.817) -- (5.453,6.924) -- (5.368,7.009) -- (5.261,7.064) -- (5.142,7.083) -- (5.142,7.083) -- (5.023,7.064) -- (4.916,7.009) -- (4.831,6.924) -- (4.776,6.817) -- (4.758,6.698) -- (4.776,6.579) -- (4.831,6.472) -- (4.916,6.387) -- (5.023,6.333) -- (5.142,6.314) -- cycle;
\node at (5.142,6.698) {\scalebox{1.635}{\small 2}};
\filldraw[fill=white, draw=black, line width=0.5pt] (9.652,7.756) -- (9.771,7.775) -- (9.878,7.83) -- (9.963,7.915) -- (10.018,8.022) -- (10.037,8.141) -- (10.018,8.26) -- (9.963,8.367) -- (9.878,8.452) -- (9.771,8.507) -- (9.652,8.525) -- (9.652,8.525) -- (9.533,8.507) -- (9.426,8.452) -- (9.341,8.367) -- (9.286,8.26) -- (9.268,8.141) -- (9.286,8.022) -- (9.341,7.915) -- (9.426,7.83) -- (9.533,7.775) -- (9.652,7.756) -- cycle;
\node at (9.652,8.141) {\scalebox{1.635}{\small 3}};
\filldraw[fill=white, draw=black, line width=0.5pt] (8.54,6.411) -- (8.659,6.43) -- (8.766,6.485) -- (8.852,6.57) -- (8.906,6.677) -- (8.925,6.796) -- (8.906,6.915) -- (8.852,7.022) -- (8.766,7.107) -- (8.659,7.162) -- (8.54,7.18) -- (8.54,7.18) -- (8.422,7.162) -- (8.314,7.107) -- (8.229,7.022) -- (8.175,6.915) -- (8.156,6.796) -- (8.175,6.677) -- (8.229,6.57) -- (8.314,6.485) -- (8.422,6.43) -- (8.54,6.411) -- cycle;
\node at (8.54,6.796) {\scalebox{1.635}{\small 4}};
\filldraw[fill=white, draw=black, line width=0.5pt] (11.546,5.833) -- (11.665,5.852) -- (11.772,5.906) -- (11.857,5.991) -- (11.912,6.099) -- (11.931,6.217) -- (11.912,6.336) -- (11.857,6.443) -- (11.772,6.529) -- (11.665,6.583) -- (11.546,6.602) -- (11.546,6.602) -- (11.428,6.583) -- (11.32,6.529) -- (11.235,6.443) -- (11.181,6.336) -- (11.162,6.217) -- (11.181,6.099) -- (11.235,5.991) -- (11.32,5.906) -- (11.428,5.852) -- (11.546,5.833) -- cycle;
\node at (11.546,6.217) {\scalebox{1.635}{\small 5}};
\filldraw[fill=white, draw=black, line width=0.5pt] (2.942,8.141) -- (3.061,8.16) -- (3.168,8.215) -- (3.253,8.3) -- (3.308,8.407) -- (3.327,8.526) -- (3.308,8.645) -- (3.253,8.752) -- (3.168,8.837) -- (3.061,8.892) -- (2.942,8.91) -- (2.942,8.91) -- (2.823,8.892) -- (2.716,8.837) -- (2.631,8.752) -- (2.576,8.645) -- (2.558,8.526) -- (2.576,8.407) -- (2.631,8.3) -- (2.716,8.215) -- (2.823,8.16) -- (2.942,8.141) -- cycle;
\node at (2.942,8.526) {\scalebox{1.635}{\small 6}};
\filldraw[fill=white, draw=black, line width=0.5pt] (1.822,5.961) -- (1.941,5.98) -- (2.048,6.035) -- (2.134,6.12) -- (2.188,6.227) -- (2.207,6.346) -- (2.188,6.465) -- (2.134,6.572) -- (2.048,6.657) -- (1.941,6.712) -- (1.822,6.73) -- (1.822,6.73) -- (1.704,6.712) -- (1.596,6.657) -- (1.511,6.572) -- (1.457,6.465) -- (1.438,6.346) -- (1.457,6.227) -- (1.511,6.12) -- (1.596,6.035) -- (1.704,5.98) -- (1.822,5.961) -- cycle;
\node at (1.822,6.346) {\scalebox{1.635}{\small 7}};
\filldraw[fill=white, draw=black, line width=0.5pt] (9.661,4.377) -- (9.78,4.396) -- (9.887,4.45) -- (9.972,4.535) -- (10.027,4.643) -- (10.046,4.761) -- (10.027,4.88) -- (9.972,4.987) -- (9.887,5.073) -- (9.78,5.127) -- (9.661,5.146) -- (9.661,5.146) -- (9.542,5.127) -- (9.435,5.073) -- (9.35,4.987) -- (9.295,4.88) -- (9.277,4.761) -- (9.295,4.643) -- (9.35,4.535) -- (9.435,4.45) -- (9.542,4.396) -- (9.661,4.377) -- cycle;
\node at (9.661,4.761) {\scalebox{1.635}{\small 8}};
\filldraw[fill=white, draw=black, line width=0.5pt] (8.483,3.053) -- (8.602,3.072) -- (8.709,3.127) -- (8.795,3.212) -- (8.849,3.319) -- (8.868,3.438) -- (8.849,3.556) -- (8.795,3.664) -- (8.709,3.749) -- (8.602,3.803) -- (8.483,3.822) -- (8.483,3.822) -- (8.365,3.803) -- (8.257,3.749) -- (8.172,3.664) -- (8.118,3.556) -- (8.099,3.438) -- (8.118,3.319) -- (8.172,3.212) -- (8.257,3.127) -- (8.365,3.072) -- (8.483,3.053) -- cycle;
\node at (8.483,3.438) {\scalebox{1.635}{\small 9}};
\filldraw[fill=white, draw=black, line width=0.5pt] (3.277,5.146) -- (3.395,5.165) -- (3.503,5.219) -- (3.588,5.304) -- (3.642,5.412) -- (3.661,5.53) -- (3.642,5.649) -- (3.588,5.756) -- (3.503,5.842) -- (3.395,5.896) -- (3.277,5.915) -- (2.915,5.915) -- (2.796,5.896) -- (2.689,5.842) -- (2.604,5.756) -- (2.549,5.649) -- (2.53,5.53) -- (2.549,5.412) -- (2.604,5.304) -- (2.689,5.219) -- (2.796,5.165) -- (2.915,5.146) -- cycle;
\node at (3.096,5.53) {\scalebox{1.635}{\small 10}};
\filldraw[fill=white, draw=black, line width=0.5pt] (2.0,2.312) -- (2.119,2.331) -- (2.226,2.386) -- (2.311,2.471) -- (2.365,2.578) -- (2.384,2.697) -- (2.365,2.815) -- (2.311,2.923) -- (2.226,3.008) -- (2.119,3.062) -- (2.0,3.081) -- (1.638,3.081) -- (1.519,3.062) -- (1.412,3.008) -- (1.327,2.923) -- (1.272,2.815) -- (1.253,2.697) -- (1.272,2.578) -- (1.327,2.471) -- (1.412,2.386) -- (1.519,2.331) -- (1.638,2.312) -- cycle;
\node at (1.819,2.697) {\scalebox{1.635}{\small 11}};
\filldraw[fill=white, draw=black, line width=0.5pt] (6.618,5.245) -- (6.737,5.263) -- (6.844,5.318) -- (6.929,5.403) -- (6.983,5.51) -- (7.002,5.629) -- (6.983,5.748) -- (6.929,5.855) -- (6.844,5.94) -- (6.737,5.995) -- (6.618,6.014) -- (6.256,6.014) -- (6.137,5.995) -- (6.03,5.94) -- (5.945,5.855) -- (5.89,5.748) -- (5.871,5.629) -- (5.89,5.51) -- (5.945,5.403) -- (6.03,5.318) -- (6.137,5.263) -- (6.256,5.245) -- cycle;
\node at (6.437,5.629) {\scalebox{1.635}{\small 12}};
\filldraw[fill=white, draw=black, line width=0.5pt] (5.114,3.079) -- (5.233,3.098) -- (5.34,3.152) -- (5.426,3.237) -- (5.48,3.345) -- (5.499,3.463) -- (5.48,3.582) -- (5.426,3.69) -- (5.34,3.775) -- (5.233,3.829) -- (5.114,3.848) -- (4.753,3.848) -- (4.634,3.829) -- (4.527,3.775) -- (4.441,3.69) -- (4.387,3.582) -- (4.368,3.463) -- (4.387,3.345) -- (4.441,3.237) -- (4.527,3.152) -- (4.634,3.098) -- (4.753,3.079) -- cycle;
\node at (4.934,3.463) {\scalebox{1.635}{\small 13}};
\filldraw[fill=white, draw=black, line width=0.5pt] (11.685,2.961) -- (11.804,2.979) -- (11.911,3.034) -- (11.997,3.119) -- (12.051,3.226) -- (12.07,3.345) -- (12.051,3.464) -- (11.997,3.571) -- (11.911,3.656) -- (11.804,3.711) -- (11.685,3.73) -- (11.324,3.73) -- (11.205,3.711) -- (11.098,3.656) -- (11.012,3.571) -- (10.958,3.464) -- (10.939,3.345) -- (10.958,3.226) -- (11.012,3.119) -- (11.098,3.034) -- (11.205,2.979) -- (11.324,2.961) -- cycle;
\node at (11.504,3.345) {\scalebox{1.635}{\small 14}};
\filldraw[fill=white, draw=black, line width=0.5pt] (6.64,1.672) -- (6.759,1.691) -- (6.866,1.746) -- (6.951,1.831) -- (7.006,1.938) -- (7.025,2.057) -- (7.006,2.176) -- (6.951,2.283) -- (6.866,2.368) -- (6.759,2.422) -- (6.64,2.441) -- (6.278,2.441) -- (6.159,2.422) -- (6.052,2.368) -- (5.967,2.283) -- (5.913,2.176) -- (5.894,2.057) -- (5.913,1.938) -- (5.967,1.831) -- (6.052,1.746) -- (6.159,1.691) -- (6.278,1.672) -- cycle;
\node at (6.459,2.057) {\scalebox{1.635}{\small 15}};
\filldraw[fill=white, draw=black, line width=0.5pt] (9.678,1.898) -- (9.797,1.917) -- (9.904,1.971) -- (9.989,2.056) -- (10.044,2.164) -- (10.063,2.283) -- (10.044,2.401) -- (9.989,2.509) -- (9.904,2.594) -- (9.797,2.648) -- (9.678,2.667) -- (9.316,2.667) -- (9.197,2.648) -- (9.09,2.594) -- (9.005,2.509) -- (8.951,2.401) -- (8.932,2.283) -- (8.951,2.164) -- (9.005,2.056) -- (9.09,1.971) -- (9.197,1.917) -- (9.316,1.898) -- cycle;
\node at (9.497,2.283) {\scalebox{1.635}{\small 16}};
\filldraw[fill=white, draw=black, line width=0.5pt] (3.304,1.511) -- (3.423,1.53) -- (3.53,1.584) -- (3.616,1.669) -- (3.67,1.776) -- (3.689,1.895) -- (3.67,2.014) -- (3.616,2.121) -- (3.53,2.206) -- (3.423,2.261) -- (3.304,2.28) -- (2.943,2.28) -- (2.824,2.261) -- (2.717,2.206) -- (2.631,2.121) -- (2.577,2.014) -- (2.558,1.895) -- (2.577,1.776) -- (2.631,1.669) -- (2.717,1.584) -- (2.824,1.53) -- (2.943,1.511) -- cycle;
\node at (3.124,1.895) {\scalebox{1.635}{\small 17}};
\filldraw[fill=yellow!35, draw=black, line width=0.5pt] (8.069,4.954) -- (8.669,4.954) -- (8.669,5.554) -- (8.069,5.554) -- cycle;
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\noindent{\small\itshape Deux carrefours reliés par une rue n'ont jamais la même couleur.}\par\addvspace{0.4em}
\noindent \textbf{1.} Le coloriage est \textbf{forcé} : une fois la couleur d'un carrefour choisie, celle de tous les autres suit, de proche en proche.\par\addvspace{0.35em}
\begin{center}
\renewcommand{\arraystretch}{1.35}
\begin{tabular}{|c|c|c|}
\hline
\cellcolor{blue!7}\bfseries Couleur & \cellcolor{blue!7}\bfseries Carrefours & \cellcolor{blue!7}\bfseries Nombre \\ \hline
sombres & B, D, G, H, K, L & 6 \\ \hline
clairs & A, C, E, F, I, J & 6 \\ \hline
\end{tabular}
\end{center}
\noindent{\color{red!80!black}\bfseries Il y a \textbf{6} carrefours sombres et \textbf{6} clairs. Il y en a \textbf{autant} de chaque côté.}\par\addvspace{0.4em}
\noindent \textbf{2.}\par\addvspace{0.35em}
\noindent{\color{green!45!black}\textbf{Le raisonnement clé.} Chaque rue relie un carrefour sombre à un carrefour clair. Donc à chaque fois que le car roule, il \textbf{change de couleur} : ses arrêts sont sombre, clair, sombre, clair\dots{} \textbf{en alternance}.}\par\addvspace{0.4em}
\noindent{\color{red!80!black}\bfseries Une tournée qui dessert les 12 carrefours alterne donc les deux couleurs d'un bout à l'autre : elle en utilise \textbf{autant de chaque, à un près}. Et si elle en utilise un de plus d'une couleur, c'est forcément celle de son \textbf{départ} et de son \textbf{arrivée}.}\par\addvspace{0.4em}
\noindent \textbf{3.}\par\addvspace{0.35em}
\noindent{\color{red!80!black}\bfseries \textbf{Oui.} Un circuit existe :}\par\addvspace{0.4em}
\newpage
\noindent \textbf{Le trajet du car}\par\addvspace{0.35em}
\noindent Le car sort de l'école et prend la \textbf{venelle du Chat ④} vers le nord jusqu'à Carrefour du Moulin \textbf{(B)}.\par\addvspace{0.35em}
\noindent Il tourne à droite dans le \textbf{chemin du Lavoir ③}, vers l'est, jusqu'à Place de l'Église \textbf{(C)}.\par\addvspace{0.35em}
\noindent Il tourne à droite dans la \textbf{rue du Moulin ⑤}, vers le sud, jusqu'à Rond-point de la Gare \textbf{(H)}.\par\addvspace{0.35em}
\noindent Il continue tout droit dans la \textbf{rue Basse ⑭}, vers le sud, jusqu'à Place du Vieux-Puits \textbf{(J)}.\par\addvspace{0.35em}
\noindent Il tourne à droite dans l'\textbf{allée des Peupliers ⑯}, vers l'ouest, jusqu'à Rond-point des Vaches \textbf{(K)}.\par\addvspace{0.35em}
\noindent Il continue tout droit dans la \textbf{rue du Puits ⑮}, vers l'ouest, jusqu'à Rond-point de la Poste \textbf{(I)}.\par\addvspace{0.35em}
\noindent Il continue tout droit dans la \textbf{rue Haute ⑰}, vers l'ouest, jusqu'à Place du Marché \textbf{(L)}.\par\addvspace{0.35em}
\noindent Il tourne à droite dans le \textbf{sentier des Prés ⑪}, vers le nord, jusqu'à Carrefour Saint-Roch \textbf{(F)}.\par\addvspace{0.35em}
\noindent Il continue tout droit dans le \textbf{chemin des Vignes ⑦}, vers le nord, jusqu'à Place des Tanneurs \textbf{(D)}.\par\addvspace{0.35em}
\noindent Il tourne à droite dans la \textbf{rue des Lilas ⑥}, vers l'est, jusqu'à Carrefour de la Mairie \textbf{(A)}.\par\addvspace{0.35em}
\noindent Il tourne à droite dans le \textbf{quai aux Fleurs ②}, vers le sud, jusqu'à Carrefour des Tilleuls \textbf{(G)}.\par\addvspace{0.35em}
\noindent Il tourne à gauche dans la \textbf{rue des Jardins ⑫}, vers l'est, jusqu'à Carrefour du Lavoir \textbf{(E)}.\par\addvspace{0.35em}
\noindent{\color{red!80!black}\bfseries Le car est passé une fois par chaque carrefour et se retrouve à l'école.}\par\addvspace{0.4em}
\noindent \textbf{4.}\par\addvspace{0.35em}
\noindent{\color{red!80!black}\bfseries \textbf{Oui}, et c'est déjà fait : le trajet ci-dessus dessert tous les carrefours. Il suffit au car de s'arrêter avant le dernier trajet de retour.}\par\addvspace{0.4em}
\end{document}
