-al a-a a-b a-c aaa aab aac aad aal aar aas ab- aba abb abc abd abl abr abs ac- aca acb acc acd acl acr acs ad- ada adb adc add adl adr ads al- ala alb alc ald all alr als ar- ara arb arc ard arl arr ars as- asa asb asc asd asl asr ass baa bab bac bad bal bar bas bba bbb bbc bbd bbl bbr bbs bca bcb bcc bcd bcl bcr bcs bda bdb bdc bdd bdl bdr bds bla blb blc bld bll blr bls bra brb brd brl brr brs bsa bsb bsc bsd bsl bsr bss c-- caa cab cac cad cal car cas cba cbb cbc cbd cbl cbr cbs cca ccb ccc ccd ccl ccr ccs cda cdb cdc cdd cdl cdr cds cl- cla clb clc cld cll clr cls cra crb crc crd crl crr crs csa csb csc csd csl csr css daa dab dac dad dal dar das dba dbb dbc dbd dbl dbr dbs dca dcb dcc dcd dcl dcr dcs dda ddb ddc ddd ddl ddr dds dl- dla dlb dlc dld dll dlr dls dra drb drc drd drl drr drs dsa dsb dsc dsd dsl dsr dss la- laa lab lac lad lal lar las lba lbb lbc lbd lbl lbr lbs lca lcb lcc lcd lcl lcr lcs lda ldb ldc ldd ldl ldr lds lla llb llc lld lll llr lls lra lrb lrc lrd lrr lrs lsa lsb lsc lsd lsl lsr lss ra- raa rab rac rad ral rar ras rba rbb rbc rbd rbl rbr rbs rca rcb rcc rcd rcl rcr rcs rda rdb rdc rdd rdl rdr rds rla rlc rld rll rlr rls rra rrb rrc rrd rrl rrr rrs rsa rsb rsc rsd rsl rsr rss saa sab sac sad sal sar sas sba sbb sbc sbd sbl sbr sbs sca scb scc scd scl scr scs sda sdb sdc sdd sdl sdr sds sla slb slc sld sll slr sls sr- sra srb src srd srl srr srs ss- ssa ssb ssc ssd ssl ssr sss