c-p-c ccccc ccell ceele ceene cell- celle cence cenel cenpl cenpn cleen clene clepe cnnnn eccen eccle eeeee eence eepee elele elene ellel ellen elnec elpee enlen epeen epene lcecn lecce leece leell lelep lelle lence lenne lepel leppe n-p-n ncell neece neele nelle neple neppe p-n-p pcell pecel peece peele peell peene pelee pelle pence pene- penne pepee pepel peple peppe pleen pleep plene