pnp pnr pnx poa pob poc poh poi pol pon poo pop por pox ppa ppb ppc pph ppi ppl ppn ppo ppp ppr ppx pra prb prc prh pri prl prn pro prp prr prx pxc pxl pxr ra- raa rab rac rah rai ral ran rao rap rar rax rba rbb rbc rbh rbi rbl rbn rbo rbp rbr rbx rca rcb rcc rch rci rcl rcn rco rcp rcr rcx rh- rha rhb rhc rhh rhi rhl rhn rho rhp rhr ria rib ric rih rii ril rin rio rip rir rix rla rlc rlh rli rll rln rlo rlp rlr rna rnb rnc rnh rni rnn rno rnp rnr roa rob roc roh roi rol ron roo rop ror rox rpa rpb rpc rph rpi rpl rpn rpo rpp rpr rpx rra rrb rrc rrh rri rrl rrn rrp rrr rxp rxr xaa xac xal xan xap xar xbc xbl xbr xbx xcb xch xci xcl xcp xcr xcx xhp xia xic xii xin xio xix xla xlb xli xlr xna xnc xno xoa xoc xoi xon xoo xop xor xox xpa xpb xpc xpl xpn xpo xpp xrc xrx xxi xxl xxo xxp xxx