c-p-c ccccc ccell ceele ceene cell- celle cence cenel cenpl cenpn cenvp cleen clene clepe cleve cnnnn eccen eccle eeeee eence eepee eevee elele elene eleve ellel ellen elnec elpee elven enlen epeen epene evell even- evene eveve lcecn lecce leece leell leeve lelep lelle lence lenne lepel leppe levec levee level leven n-p-n ncell neece neele neeve nelle neple neppe nevel neven nevve p-n-p pcell pecel peece peele peell peene peeve pelee pelle pelv- pence pene- penev penne pepee pepel peple peppe pleen pleep plene veele veell veeve velen velev velle vence venee venel venev venne vepen vevce