a-ak aaaa aaab aaal aaas aaba aabb aabl aaka aala aall aals aasa aass abaa abab abak abal abas abb- abba abbb abbs abla abls abs- absa absl abss akaa akal akas akka aksa alaa alak alal alas alb- alba albs alk- alka alkb all- alla alll alls alsa asaa asab asak asal asas asba aska asks asla assa assk assl asss baaa baak baal baas baba babb babs bak- baka bakl baks bala balk ball bals basa bask bass bbas bbbb bbbs bblb bbls blaa blab blak blas blkb blls blss bsaa bsas kaaa kaab kaak kaal kaas kaba kabb kaka kakk kaks kala kalb kalk kall kals kas- kasa kasb kask kasl kass kbaa kbab kbak kbal kbas kbba kbbb kbbk kbbl kbbs kbkb kbkk kbkl kbla kblb kbll kbls kbsa kbsb kbsk kbss kkaa kkal kkba kkbb kkbl kkbs kkkk kklb kkll kkls kksa kkss klaa klab klak klal klas klbb klbl klbs klka klkk klkl klks klla kllb kllk klls klsa ksab ksak ksal ksas ksba ksbl ksbs kska kskb kskk ksks ksla kslb kslk ksll kssa kssl ksss laaa laak laal laas laba labs laka laks lala lall lasa lask lass lkab lkal llbs llks llll lsla lssa saab saak saal saas saba sabb sabs saka sakb sakk saks sala salk sall sals sasa sask sasl sass sbaa sbas sbbs sbsa skab skal skss slaa slab slak slas slsa ssaa ssab ssas ssla sssa sssb ssss