poi pol poo pop por pox ppa ppc ppe ppg pph ppi ppl ppo ppp ppr ppx pra prc pre prg prh pri prl pro prp prr prx pxc pxe pxg pxl pxr ra- raa rac rae rag rah rai ral rao rap rar rax rca rcc rce rcg rch rci rcl rco rcp rcr rcx re- rea rec ree reg reh rei rel reo rep rer rex rga rgc rge rgg rgh rgi rgo rgp rgr rgx rh- rha rhc rhe rhg rhh rhi rhl rho rhp rhr ria ric rie rig rih rii ril rio rip rir rix rla rlc rle rlg rlh rli rll rlo rlp rlr roa roc roe rog roh roi rol roo rop ror rox rpa rpc rpe rpg rph rpi rpl rpo rpp rpr rpx rra rrc rrg rrh rri rrl rrp rrr rxp rxr xaa xac xag xal xap xar xch xci xcl xcp xcr xcx xee xeg xel xep xer xex xge xgi xgl xgp xhp xia xic xie xii xio xix xla xlg xli xlr xoa xoc xog xoi xoo xop xor xox xpa xpc xpe xpg xpl xpo xpp xrc xrx xxi xxl xxo xxp xxx