a-a a-b aaa aab aak aan aas aau ab- aba abb abk abn abs abu aka akb akk akn aks aku an- ana anb ank ann ans anu as- asa asb ask asn ass asu au- aua aub auk aun aus b-u baa bab bak ban bas bau bba bbb bbk bbn bbs bbu bka bkb bkk bkn bks bna bnb bnk bnn bns bnu bsa bsb bsk bsn bss bsu bua bub buk bun bus buu ka- kaa kab kak kan kas kau kba kbb kbk kbn kbs kbu kkb kkk kkn kks kku kn- kna knk knn knu ksa ksb ksk ksn kss ksu kub kuk kun kus kuu naa nab nak nan nas nau nba nbb nbk nbn nbs nbu nka nkk nkn nks nku nna nnb nnk nnn nns nnu nsa nsb nsk nsn nss nsu nua nub nuk nun nus nuu saa sab sak san sas sau sba sbb sbk sbn sbs sbu sk- ska skb skk sks sku sna snb snk snn sns snu ss- ssa ssb ssk ssn sss ssu sua sub suk sun sus suu ua- uaa uab uak uan uas uau uba ubb ubk ubn ubs ubu uka ukb ukk ukn uku un- una unb unk unn uns unu usa usb usk usn uss usu uua uun uus uuu