-al a-a a-b a-c a-t aaa aab aac aak aal aar aat ab- aba abb abc abk abl abr abt ac- aca acb acc ack acl acr act aka akb akc akk akl akr al- ala alb alc alk all alr alt ar- ara arb arc ark arl arr art at- ata atb atc atl atr att baa bab bac bak bal bar bat bba bbb bbc bbk bbl bbr bbt bca bcb bcc bck bcl bcr bct bka bkb bkc bkk bkl bkr bkt bla blb blc blk bll blr blt bra brb brk brl brr brt bta btb btc btk btl btr btt c-- caa cab cac cak cal car cat cba cbb cbc cbk cbl cbr cbt cca ccb ccc cck ccl ccr cct cka ckb ckc ckt cl- cla clb clc clk cll clr clt cra crb crc crk crl crr crt cta ctb ctc ctk ctl ctr ctt k-t ka- kaa kab kac kak kal kar kat kba kbb kbc kbk kbl kbr kca kcb kcc kck kcl kcr kct kkb kkc kkk kkl kkr kkt kl- kla klb klc klr klt kra krc krk krl krr krt kta ktb ktc ktk ktl ktr ktt la- laa lab lac lak lal lar lat lba lbb lbc lbk lbl lbr lbt lca lcb lcc lck lcl lcr lct lka lkb lkl lkr lkt lla llb llc llk lll llr llt lra lrb lrc lrk lrr lrt lta ltb ltc ltk ltl ltr ltt ra- raa rab rac rak ral rar rat rba rbb rbc rbk rbl rbr rbt rca rcb rcc rcl rcr rct rkb rkc rkk rkt rla rlc rll rlr rlt rra rrb rrc rrk rrl rrr rrt rta rtb rtc rtk rtl rtr rtt taa tab tac tak tal tar tat tba tbb tbc tbk tbl tbr tbt tca tcb tcc tck tcl tcr tct tka tkb tkc tkk tkl tkr tkt tla tlc tlk tll tlr tlt tra trb trc trk trl trr trt tta ttb ttc ttk ttl ttr ttt