-al a-a a-b a-t aaa aab aal aap aar aat ab- aba abb abl abp abr abt al- ala alb all alp alr alt ap- apa apb apl app apr apt ar- ara arb arl arp arr art at- ata atb atl atp atr att b-p baa bab bal bap bar bat bba bbb bbl bbp bbr bbt bla blb bll blp blr blt bpa bpb bpl bpp bpr bpt bra brb brl brp brr brt bta btb btl btp btr btt l-p la- laa lab lal lap lar lat lba lbb lbl lbp lbr lbt lla llb lll llp llr llt lpa lpb lpl lpp lpr lpt lra lrb lrp lrr lrt lta ltb ltl ltp ltr ltt p-p paa pab pal pap par pat pba pbb pbl pbp pbr pbt pla plb pll plp plr plt ppa ppb ppl ppp ppr ppt pra prb prl prp prr prt pt- pta ptb ptl ptp ptr ptt ra- raa rab ral rap rar rat rba rbb rbl rbp rbr rbt rla rll rlp rlr rlt rpa rpb rpl rpp rpr rpt rra rrb rrl rrp rrr rrt rta rtb rtl rtp rtr rtt taa tab tal tap tar tat tba tbb tbl tbp tbr tbt tla tll tlp tlr tlt tpa tpb tpl tpp tpr tpt tra trb trl trp trr trt tta ttb ttl ttp ttr ttt