-al a-a a-b a-i aaa aab aai aal aap aar ab- aba abb abi abl abp abr ai- aia aib aii ail aip air al- ala alb ali all alp alr ap- apa apb api apl app apr ar- ara arb ari arl arp arr b-p baa bab bai bal bap bar bba bbb bbi bbl bbp bbr bi- bia bib bii bil bip bir bla blb bli bll blp blr bpa bpb bpi bpl bpp bpr bra brb bri brl brp brr ia- iaa iab iai ial iap iar iba ibb ibi ibl ibp ibr iia iib iii iil iip iir il- ila ilb ili ill ilp ilr ipa ipb ipi ipl ipp ipr ir- ira irb iri irl irp irr l-p la- laa lab lai lal lap lar lba lbb lbi lbl lbp lbr lia lib lii lil lip lir lla llb lli lll llp llr lpa lpb lpi lpl lpp lpr lra lrb lri lrp lrr p-p paa pab pai pal pap par pba pbb pbi pbl pbp pbr pia pib pii pil pip pir pla plb pli pll plp plr ppa ppb ppi ppl ppp ppr pra prb pri prl prp prr ra- raa rab rai ral rap rar rba rbb rbi rbl rbp rbr ria rib rii ril rip rir rla rli rll rlp rlr rpa rpb rpi rpl rpp rpr rra rrb rri rrl rrp rrr