-al -ol a-a a-b a-c aaa aab aac aae aal aao aap ab- aba abb abc abe abl abo abp ac- aca acb acc ace acl aco acp aea aeb aec aee ael aeo aep al- ala alb alc ale all alo alp aoa aob aoc aoe aol aoo aop ap- apa apb apc ape apl apo app b-p baa bab bac bae bal bao bap bba bbb bbc bbe bbl bbo bbp bca bcb bcc bce bcl bco bcp be- bea beb bec bee bel beo bep bla blb blc ble bll blo blp boa bob boc boe bol boo bop bpa bpb bpc bpe bpl bpo bpp c-- caa cab cac cae cal cao cap cba cbb cbc cbe cbl cbo cbp cca ccb ccc cce ccl cco ccp ce- cea ceb cec cee cel ceo cep cl- cla clb clc cle cll clo clp co- coa cob coc coe col coo cop cpa cpb cpc cpe cpl cpo cpp eaa eab eac eae eal eao eap eba ebb ebc ebe ebl ebo ebp ec- eca ecb ecc ece ecl eco eea eeb eec eee eel eeo eep ela elb elc ele ell elo elp eo- eoa eob eoc eoe eol eoo eop ep- epa epb epc epe epl epo epp l-p la- laa lab lac lae lal lao lap lba lbb lbc lbe lbl lbo lbp lca lcb lcc lce lcl lco lcp lea leb lec lee lel leo lep lla llb llc lle lll llo llp loa lob loc loe lol loo lop lpa lpb lpc lpe lpl lpo lpp oaa oab oac oae oal oao oap ob- oba obb obc obe obl obo obp oc- oca ocb occ ocl oco ocp oea oeb oec oee oel oeo oep ola olb olc ole oll olo olp oo- ooa oob ooc ool ooo oop op- opa opb opc ope opl opo opp p-p paa pab pac pae pal pao pap pba pbb pbc pbe pbl pbo pbp pca pcb pcc pce pcl pco pcp pea peb pec pee pel peo pep pla plb plc ple pll plo plp poa pob poc poe pol poo pop ppa ppb ppc ppe ppl ppo ppp