pog poh poi poo pop por pox ppa ppc ppd ppe ppg pph ppi ppo ppp ppr ppx pra prc prd pre prg prh pri pro prp prr prx pxc pxe pxg pxr ra- raa rac rad rae rag rah rai rao rap rar rax rca rcc rcd rce rcg rch rci rco rcp rcr rcx rda rdc rdd rde rdg rdh rdi rdo rdp rdr rdx re- rea rec red ree reg reh rei reo rep rer rex rga rgc rgd rge rgg rgh rgi rgo rgp rgr rgx rh- rha rhc rhd rhe rhg rhh rhi rho rhp rhr ria ric rid rie rig rih rii rio rip rir rix roa roc rod roe rog roh roi roo rop ror rox rpa rpc rpd rpe rpg rph rpi rpo rpp rpr rpx rra rrc rrd rrg rrh rri rrp rrr rxp rxr xaa xac xad xag xap xar xcd xch xci xcp xcr xcx xda xdc xde xdh xdi xdr xed xee xeg xep xer xex xge xgi xgp xhd xhp xia xic xie xii xio xix xoa xoc xod xog xoi xoo xop xor xox xpa xpc xpd xpe xpg xpo xpp xrc xrd xrx xxi xxo xxp xxx