rep rer res rex ria ric rid rie rii rin rio rip rir ris rix rna rnc rnd rni rnn rno rnp rnr rns roa roc rod roe roi ron roo rop ror ros rox rpa rpc rpd rpe rpi rpn rpo rpp rpr rps rpx rra rrc rrd rri rrn rrp rrr rrs rsa rsc rsd rse rsi rsn rso rsp rsr rss rsx rxp rxr rxs saa sac sad sae sai san sao sap sar sas sax sca scc scd sce sci scn sco scp scr scs scx sda sdc sdd sde sdi sdn sdo sdp sdr sds se- sea sec sed see sei sen seo sep ser ses sex sia sic sid sie sii sin sio sip sir sis six sna snc snd sne sni snn sno snp snr sns soa soc sod soe soi son soo sop sor sos sox spa spc spd spe spi spn spo spp spr sps spx sr- sra src srd sre sri srn sro srp srr srs srx ss- ssa ssc ssd sse ssi ssn sso ssp ssr sss ssx sxc sxi sxn sxs xaa xac xad xan xap xar xas xcd xci xcp xcr xcx xda xdc xde xdi xdr xds xed xee xen xep xer xes xex xia xic xie xii xin xio xis xix xna xnc xno xns xoa xoc xod xoi xon xoo xop xor xos xox xpa xpc xpd xpe xpn xpo xpp xps xrc xrd xrx xsa xsc xsi xsp xss xxi xxo xxp xxx