a-a a-b aaa aab aah aan aao aas aax ab- aba abb abh abn abo abs abx aha ahb ahh ahn aho ahs ahx an- ana anb anh ann ano ans anx aoa aob aoh aon aoo aos aox as- asa asb ash asn aso ass asx ax- axa axh axn axo axs axx baa bab bah ban bao bas bax bba bbb bbh bbn bbo bbs bbx bha bhb bhh bho bhs bhx bna bnb bnn bno bns bnx boa bob boh bon boo bos box bsa bsb bsh bsn bso bss bsx bxb bxn bxo bxx haa hab hah han hao has hax hba hbb hbh hbn hbo hbs hbx hha hhb hhh hhn hho hhs hna hnb hnh hnn hno hns hoa hob hoh hon hoo hos hox hsa hsb hsh hsn hss hsx naa nab nah nan nao nas nax nba nbb nbn nbo nbs nbx nha nhb nhh nhn nhs nna nnb nnh nnn nno nns no- noa nob noh non noo nos nox nsa nsb nsh nsn nso nss nsx oaa oab oah oan oao oas oax ob- oba obb obh obn obo obs obx oha ohh ohn oho ohs on- ona onb onh onn ono ons onx oo- ooa oob ooh oon ooo oos oox os- osa osb osh osn oso oss osx ox- oxa oxb oxn oxo oxx saa sab sah san sao sas sax sba sbb sbh sbn sbo sbs sbx sh- sha shb shh shn sho shs sna snb snn sno sns soa sob soh son soo sos sox ss- ssa ssb ssh ssn sso sss ssx sxn sxs xaa xan xas xbx xna xno xns xoa xon xoo xos xox xsa xsb xss xxo xxx