-al a-a a-b a-c aaa aab aac aal aap aar ab- aba abb abc abl abp abr ac- aca acb acc acl acp acr al- ala alb alc all alp alr ap- apa apb apc apl app apr ar- ara arb arc arl arp arr b-p baa bab bac bal bap bar bba bbb bbc bbl bbp bbr bca bcb bcc bcl bcp bcr bla blb blc bll blp blr bpa bpb bpc bpl bpp bpr bra brb brl brp brr c-- caa cab cac cal cap car cba cbb cbc cbl cbp cbr cca ccb ccc ccl ccp ccr cl- cla clb clc cll clp clr cpa cpb cpc cpl cpp cpr cra crb crc crl crp crr l-p la- laa lab lac lal lap lar lba lbb lbc lbl lbp lbr lca lcb lcc lcl lcp lcr lla llb llc lll llp llr lpa lpb lpc lpl lpp lpr lra lrb lrc lrp lrr p-p paa pab pac pal pap par pba pbb pbc pbl pbp pbr pca pcb pcc pcl pcp pcr pla plb plc pll plp plr ppa ppb ppc ppl ppp ppr pra prb prc prl prp prr ra- raa rab rac ral rap rar rba rbb rbc rbl rbp rbr rca rcb rcc rcl rcp rcr rla rlc rll rlp rlr rpa rpb rpc rpl rpp rpr rra rrb rrc rrl rrp rrr