a-a a-b a-i aaa aab aai aap aar aav ab- aba abb abi abp abr abv ai- aia aib aii aip air aiv ap- apa apb api app apr apv ar- ara arb ari arp arr arv av- ava avb avi avp avr b-p baa bab bai bap bar bav bba bbb bbi bbp bbr bi- bia bib bii bip bir biv bpa bpb bpi bpp bpr bpv bra brb bri brp brr brv bva bvb bvi bvp bvr bvv i-v ia- iaa iab iai iap iar iav iba ibb ibi ibp ibr ibv iia iib iii iip iir ipa ipb ipi ipp ipr ipv ir- ira irb iri irp irr irv iva ivb ivi ivp ivr ivv p-p paa pab pai pap par pav pba pbb pbi pbp pbr pia pib pii pip pir piv ppa ppb ppi ppp ppr ppv pra prb pri prp prr prv pva pvb pvi pvp pvr pvv ra- raa rab rai rap rar rav rba rbb rbi rbp rbr ria rib rii rip rir riv rpa rpb rpi rpp rpr rpv rra rrb rri rrp rrr rva rvb rvi rvp rvr rvv v-a vaa vab vai vap var vav vba vbi vbr vbv vi- via vib vii vip vir viv vpa vpb vpi vpp vpr vra vrb vri vrp vrr vva vvb vvi vvr vvv