bbb bbc bbe bbl bcb bcc bce bcl bcz be- beb bec bee bel bez blb blc ble bll blz bze bzz c-- cbb cbc cbe cbl cbz ccb ccc cce ccl ccz ce- ceb cec cee cel cez cl- clb clc cle cll clz cz- czc cze ebb ebc ebe ebl ec- ecb ecc ece ecl eeb eec eee eel elb elc ele ell elz eze ezz lbb lbc lbe lbl lcb lcc lce lcl leb lec lee lel lez llb llc lle lll llz zbb zbc zbl zce zcl zeb zec zee zel zez zzz