-al a-a a-b a-c a-t aaa aab aac aal aap aat ab- aba abb abc abl abp abt ac- aca acb acc acl acp act al- ala alb alc all alp alt ap- apa apb apc apl app apt at- ata atb atc atl atp att b-p baa bab bac bal bap bat bba bbb bbc bbl bbp bbt bca bcb bcc bcl bcp bct bla blb blc bll blp blt bpa bpb bpc bpl bpp bpt bta btb btc btl btp btt c-- caa cab cac cal cap cat cba cbb cbc cbl cbp cbt cca ccb ccc ccl ccp cct cl- cla clb clc cll clp clt cpa cpb cpc cpl cpp cpt cta ctb ctc ctl ctp ctt l-p la- laa lab lac lal lap lat lba lbb lbc lbl lbp lbt lca lcb lcc lcl lcp lct lla llb llc lll llp llt lpa lpb lpc lpl lpp lpt lta ltb ltc ltl ltp ltt p-p paa pab pac pal pap pat pba pbb pbc pbl pbp pbt pca pcb pcc pcl pcp pct pla plb plc pll plp plt ppa ppb ppc ppl ppp ppt pt- pta ptb ptc ptl ptp ptt taa tab tac tal tap tat tba tbb tbc tbl tbp tbt tca tcb tcc tcl tcp tct tla tlc tll tlp tlt tpa tpb tpc tpl tpp tpt tta ttb ttc ttl ttp ttt