ror ros rox rra rrc rrf rrg rrl rrn rrr rrs rsa rsc rse rsf rsg rsl rsn rso rsr rss rsx rxr rxs saa sac sae saf sag sal san sao sar sas sax sca scc sce scf scg scl scn sco scr scs scx se- sea sec see sef seg sel sen seo ser ses sex sfa sfc sfe sff sfg sfl sfn sfo sfr sfs sfx sga sgc sge sgf sgg sgl sgn sgo sgr sgs sgx sla slc sle slf slg sll sln slo slr sls slx sna snc sne snf sng snl snn sno snr sns soa soc soe sof sog sol son soo sor sos sox sr- sra src sre srf srg srl srn sro srr srs srx ss- ssa ssc sse ssf ssg ssl ssn sso ssr sss ssx sxc sxl sxn sxs xaa xac xaf xag xal xan xar xas xcf xcl xcr xcx xee xeg xel xen xer xes xex xfa xfe xfl xfn xfs xfx xge xgl xla xlf xlg xlr xls xna xnc xno xns xoa xoc xof xog xon xoo xor xos xox xrc xrf xrx xsa xsc xsl xss xxl xxo xxx