a-a a-b a-i aaa aab aai aak aap aas ab- aba abb abi abk abp abs ai- aia aib aii aik aip ais aka akb aki akk akp aks ap- apa apb api apk app aps as- asa asb asi ask asp ass b-p baa bab bai bak bap bas bba bbb bbi bbk bbp bbs bi- bia bib bii bik bip bis bka bkb bkk bkp bks bpa bpb bpi bpp bps bsa bsb bsi bsk bsp bss ia- iaa iab iai iap ias iba ibb ibi ibk ibp ibs iia iib iii iip iis ika ikb iki ikk iks ipa ipb ipi ipp ips is- isa isb isi isk isp iss ka- kaa kab kai kak kap kas kba kbb kbi kbk kbp kbs kia kib kii kik kip kis kkb kki kkk kkp kks kpa kpi kpk kpp kps ksa ksb ksi ksk ksp kss p-p paa pab pai pak pap pas pba pbb pbi pbk pbp pbs pia pib pii pik pip pis pka pkb pki pkp pks ppa ppb ppi ppk ppp pps ps- psa psb psi psk psp pss saa sab sai sak sap sas sba sbb sbi sbk sbp sbs sia sib sii sik sip sis sk- ska skb ski skk skp sks spa spb spi spk spp sps ss- ssa ssb ssi ssk ssp sss