a-a a-b a-i aaa aab aai aap aar aas aay ab- aba abb abi abp abr abs aby ai- aia aib aii aip air ais aiy ap- apa apb api app apr aps apy ar- ara arb ari arp arr ars ary as- asa asb asi asp asr ass asy ay- aya ayi ayp ayr ays b-p baa bab bai bap bar bas bay bba bbb bbi bbp bbr bbs bby bi- bia bib bii bip bir bis biy bpa bpb bpi bpp bpr bps bpy bra brb bri brp brr brs bry bsa bsb bsi bsp bsr bss bsy by- bya byi byp byr bys ia- iaa iab iai iap iar ias iba ibb ibi ibp ibr ibs iby iia iib iii iip iir iis ipa ipb ipi ipp ipr ips ipy ir- ira irb iri irp irr irs iry is- isa isb isi isp isr iss isy iya iyr iys iyy p-p paa pab pai pap par pas pay pba pbb pbi pbp pbr pbs pby pia pib pii pip pir pis ppa ppb ppi ppp ppr pps pra prb pri prp prr prs pry ps- psa psb psi psp psr pss psy py- pya pyb pyr pys ra- raa rab rai rap rar ras ray rba rbb rbi rbp rbr rbs ria rib rii rip rir ris riy rpa rpb rpi rpp rpr rps rra rrb rri rrp rrr rrs rsa rsb rsi rsp rsr rss ry- rya ryr rys ryy saa sab sai sap sar sas say sba sbb sbi sbp sbr sbs sby sia sib sii sip sir sis spa spb spi spp spr sps spy sr- sra srb sri srp srr srs sry ss- ssa ssb ssi ssp ssr sss sy- sya syb syi syp syr sys yaa yab yai yap yar yas yay ybi ybp ybr ybs yby yii yip yir yis ypa yps yra yrp yrs ysa ysb ysi ysp ysr yss ysy yyb yys yyy