-up b-p b-u bbb bbd bbi bbp bbr bbu bdb bdd bdi bdp bdr bdu bi- bib bid bii bip bir biu bpb bpd bpi bpp bpr bpu brb brd bri brp brr bru bub bud bui bup bur buu dbb dbd dbi dbp dbr dbu ddb ddd ddi ddp ddr ddu di- dib did dii dip dir diu dpb dpd dpi dpp dpr dpu drb drd dri drp drr dru dub dud dui dup dur i-d ibb ibd ibi ibp ibr ibu idb idd idi idp idr idu iib iid iii iip iir iiu ipb ipd ipi ipp ipr ipu ir- irb ird iri irp irr iru iu- iub iud iui iup iur p-p pbb pbd pbi pbp pbr pbu pdb pdd pdi pdp pdr pdu pib pid pii pip pir piu ppb ppd ppi ppp ppr ppu prb prd pri prp prr pru pub pud pui pup pur puu rbb rbd rbi rbp rbr rbu rdb rdd rdi rdp rdr rdu rib rid rii rip rir rpb rpd rpi rpp rpr rpu rrb rrd rri rrp rrr rru rub rud rui rup rur ruu ubb ubi ubp ubr ubu udb udd udi udp udr udu uib uid uii uip uir uiu up- upb upd upi upp upr upu ur- urb urd uri urp urr uru uur uuu