a-a a-b a-c aaa aab aac aah aan aas aau ab- aba abb abc abh abn abs abu ac- aca acb acc ach acn acs acu aha ahb ahc ahh ahn ahs ahu an- ana anb anc anh ann ans anu as- asa asb asc ash asn ass asu au- aua aub auc auh aun aus b-u baa bab bac bah ban bas bau bba bbb bbc bbh bbn bbs bbu bca bcb bcc bch bcn bcs bcu bha bhb bhc bhh bhs bhu bna bnb bnc bnn bns bnu bsa bsb bsc bsh bsn bss bsu bua bub buc buh bun bus buu c-- caa cab cac cah can cas cau cba cbb cbc cbh cbn cbs cbu cca ccb ccc cch ccn ccs ccu ch- cha chb chc chh chn chs chu cn- cna cnb cnc cnh cnn cns cnu csa csb csc csh csn css csu cua cub cuc cuh cun cus cuu haa hab hac hah han has hau hba hbb hbc hbh hbn hbs hbu hca hcb hcc hch hcn hcs hha hhb hhc hhh hhn hhs hhu hna hnb hnc hnh hnn hns hnu hsa hsb hsc hsh hsn hss hsu hua hub huc huh hun hus huu naa nab nac nah nan nas nau nba nbb nbc nbn nbs nbu nca ncb ncc nch ncn ncs ncu nha nhb nhc nhh nhn nhs nhu nna nnb nnc nnh nnn nns nnu nsa nsb nsc nsh nsn nss nsu nua nub nuc nuh nun nus nuu saa sab sac sah san sas sau sba sbb sbc sbh sbn sbs sbu sca scb scc sch scn scs scu sh- sha shb shc shh shn shs shu sna snb snc snn sns snu ss- ssa ssb ssc ssh ssn sss ssu sua sub suc suh sun sus suu ua- uaa uab uac uah uan uas uau uba ubb ubc ubh ubn ubs ubu uca ucb ucc uch ucn ucs ucu uha uhb uhc uhh uhs uhu un- una unb unc unh unn uns unu usa usb usc ush usn uss usu uua uuc uun uus uuu