a-a a-b a-i aaa aab aad aai aap aar ab- aba abb abd abi abp abr ad- ada adb add adi adp adr ai- aia aib aid aii aip air ap- apa apb apd api app apr ar- ara arb ard ari arp arr b-p baa bab bad bai bap bar bba bbb bbd bbi bbp bbr bda bdb bdd bdi bdp bdr bi- bia bib bid bii bip bir bpa bpb bpd bpi bpp bpr bra brb brd bri brp brr daa dab dad dai dap dar dba dbb dbd dbi dbp dbr dda ddb ddd ddi ddp ddr di- dia dib did dii dip dir dpa dpb dpd dpi dpp dpr dra drb drd dri drp drr i-d ia- iaa iab iad iai iap iar iba ibb ibd ibi ibp ibr ida idb idd idi idp idr iia iib iid iii iip iir ipa ipb ipd ipi ipp ipr ir- ira irb ird iri irp irr p-p paa pab pad pai pap par pba pbb pbd pbi pbp pbr pda pdb pdd pdi pdp pdr pia pib pid pii pip pir ppa ppb ppd ppi ppp ppr pra prb prd pri prp prr ra- raa rab rad rai rap rar rba rbb rbd rbi rbp rbr rda rdb rdd rdi rdp rdr ria rib rid rii rip rir rpa rpb rpd rpi rpp rpr rra rrb rrd rri rrp rrr