-al a-a a-b a-c aaa aab aac aae aak aal aap ab- aba abb abc abe abk abl abp ac- aca acb acc ace ack acl acp aea aeb aec aee aek ael aep aka akb akc ake akk akl akp al- ala alb alc ale alk all alp ap- apa apb apc ape apk apl app b-p baa bab bac bae bak bal bap bba bbb bbc bbe bbk bbl bbp bca bcb bcc bce bck bcl bcp be- bea beb bec bee bek bel bep bka bkb bkc bke bkk bkl bkp bla blb blc ble blk bll blp bpa bpb bpc bpe bpl bpp c-- caa cab cac cae cak cal cap cba cbb cbc cbe cbk cbl cbp cca ccb ccc cce cck ccl ccp ce- cea ceb cec cee cek cel cep cka ckb ckc cl- cla clb clc cle clk cll clp cpa cpb cpc cpe cpk cpl cpp eaa eab eac eae eak eal eap eba ebb ebc ebe ebk ebl ebp ec- eca ecb ecc ece eck ecl eea eeb eec eee eek eel eep eka ekb ekc eke ekl ekp ela elb elc ele elk ell elp ep- epa epb epc epe epl epp ka- kaa kab kac kae kak kal kap kba kbb kbc kbe kbk kbl kbp kca kcb kcc kce kck kcl kcp ke- kea keb kec kee kek kel kep kkb kkc kke kkk kkl kkp kl- kla klb klc kpa kpc kpe kpk kpl kpp l-p la- laa lab lac lae lak lal lap lba lbb lbc lbe lbk lbl lbp lca lcb lcc lce lck lcl lcp lea leb lec lee lek lel lep lka lkb lkl lkp lla llb llc lle llk lll llp lpa lpb lpc lpe lpk lpl lpp p-p paa pab pac pae pak pal pap pba pbb pbc pbe pbk pbl pbp pca pcb pcc pce pck pcl pcp pea peb pec pee pek pel pep pka pkb pkc pke pkl pkp pla plb plc ple plk pll plp ppa ppb ppc ppe ppk ppl ppp