-al a-a a-b a-c aaa aab aac aad aal aar ab- aba abb abc abd abl abr ac- aca acb acc acd acl acr ad- ada adb adc add adl adr al- ala alb alc ald all alr ar- ara arb arc ard arl arr baa bab bac bad bal bar bba bbb bbc bbd bbl bbr bca bcb bcc bcd bcl bcr bda bdb bdc bdd bdl bdr bla blb blc bld bll blr bra brb brd brl brr c-- caa cab cac cad cal car cba cbb cbc cbd cbl cbr cca ccb ccc ccd ccl ccr cda cdb cdc cdd cdl cdr cl- cla clb clc cld cll clr cra crb crc crd crl crr daa dab dac dad dal dar dba dbb dbc dbd dbl dbr dca dcb dcc dcd dcl dcr dda ddb ddc ddd ddl ddr dl- dla dlb dlc dld dll dlr dra drb drc drd drl drr la- laa lab lac lad lal lar lba lbb lbc lbd lbl lbr lca lcb lcc lcd lcl lcr lda ldb ldc ldd ldl ldr lla llb llc lld lll llr lra lrb lrc lrd lrr ra- raa rab rac rad ral rar rba rbb rbc rbd rbl rbr rca rcb rcc rcd rcl rcr rda rdb rdc rdd rdl rdr rla rlc rld rll rlr rra rrb rrc rrd rrl rrr