APE; AUE; CEE; CEP; CIS; EAU; ESS; ICE; IOS; ISO; OES; OSE; PEA; PEC; PEE; PES; QIS; SEA; SEC; SEE; SEI; SIC; SIS; SOU.
APES; CEES; CEPE; CESS; EUOI; ICES; PECS; PEES; PESO; SECS; SEEP; SEIS; SICE; SICS; SIES; SOAP.
CEPES; ISSEI; PEISE; SICES.