b-u bbb bbc bbe bbo bbu bcb bcc bce bco bcu bcz be- beb bec bee beo beu bez bob boc boe boo bou boz bub buc bue buo buu buz bze bzo bzu bzz c-- cbb cbc cbe cbo cbu cbz ccb ccc cce cco ccu ccz ce- ceb cec cee ceo ceu cez co- cob coc coe coo cou coz cub cuc cue cuo cuu cuz cz- czc cze czo ebb ebc ebe ebo ebu ec- ecb ecc ece eco ecu eeb eec eee eeo eo- eob eoc eoe eoo eou eu- eub euc eue eze ezo ezz ob- obb obc obe obo obu oc- ocb occ oco ocu ocz oeb oec oee oeo oo- oob ooc ooo ou- ouc oue ouo oze ozo ozu ozz ubb ubc ube ubo ubu ucb ucc uce uco ucu ueb uec uee uob uoc uoe uoo uuc uue uuu uzb uzo uzu zbb zbc zce zco zeb zec zee zeo zez zo- zob zoc zoe zoo zou zub zuc zuz zzz