cccc cccp ccoc ccpp cctc cctt coco cocp coct coop coot copo copp copt copy cotc coto cott coty coyo coyt cozy cozz cptp ctcp ctot ctpo ctpp cyc- cycc cypc cyt- cyto cyy- cyyc czyz occc occt ocpp oct- octo octy oooo ootp ooty oozy opo- oppo oppy opto oto- otoo otoy otpp otto ozzy pccc pcpp poco poop poot pop- popc popo popp popt popy potc poto pott poty poyo pozo ppcc pppo pppp pptt ptcc ptop pttc pyo- pyot pypy pytt pyzy tccc tcpo tcpy tctc to-y toco toot top- topo topp topt topz totc toto tott toty toyo toyt toyz tozo tozy tpcp tppp tptp tpyo ttcp ttop ttoy tttt tyco typ- typo typp typy tyto tytt tyty tzzt yccc yctc yoop yoot yooz yopo yopy yott yoyo yozo ypcc yyyy zoco zoo- zoop zoot zopy zott zoty zotz zozo ztop zypp zzzz