pba pbb pbc pbd pbi pbn pbo pbp pbr pbs pca pcb pcc pcd pch pci pcn pco pcp pcr pcs pda pdb pdc pdd pdh pdi pdn pdo pdp pdr pds pha phb phc phd phi phn pho php phr phs pia pib pic pid pih pii pin pio pip pir pis pn- pna pnb pnc pnd pnh pni pnn pno pnp pnr pns poa pob poc pod poh poi pon poo pop por pos ppa ppb ppc ppd pph ppi ppn ppo ppp ppr pps pra prb prc prd prh pri prn pro prp prr prs ps- psa psb psc psd psh psi psn pso psp psr pss ra- raa rab rac rad rah rai ran rao rap rar ras rba rbb rbc rbd rbh rbi rbn rbo rbp rbr rbs rca rcb rcc rcd rch rci rcn rco rcp rcr rcs rda rdb rdc rdd rdh rdi rdn rdo rdp rdr rds rh- rha rhb rhc rhd rhh rhi rhn rho rhp rhr rhs ria rib ric rid rih rii rin rio rip rir ris rna rnb rnc rnd rnh rni rnn rno rnp rnr rns roa rob roc rod roh roi ron roo rop ror ros rpa rpb rpc rpd rph rpi rpn rpo rpp rpr rps rra rrb rrc rrd rrh rri rrn rrp rrr rrs rsa rsb rsc rsd rsh rsi rsn rso rsp rsr rss saa sab sac sad sah sai san sao sap sar sas sba sbb sbc sbd sbh sbi sbn sbo sbp sbr sbs sca scb scc scd sch sci scn sco scp scr scs sda sdb sdc sdd sdh sdi sdn sdo sdp sdr sds sh- sha shb shc shd shh shi shn sho shp shr shs sia sib sic sid sih sii sin sio sip sir sis sna snb snc snd sni snn sno snp snr sns soa sob soc sod soh soi son soo sop sor sos spa spb spc spd sph spi spn spo spp spr sps sr- sra srb src srd srh sri srn sro srp srr srs ss- ssa ssb ssc ssd ssh ssi ssn sso ssp ssr sss