-er -ic c-- ccc cce ccf cci ccr ccs ccu ccx ce- cec cee cef cei cer ces ceu cex cfc cfe cff cfi cfr cfs cfu cfx ci- cic cie cif cii cir cis ciu cix crc cre crf cri crr crs cru crx csc cse csf csi csr css csu csx cuc cue cuf cui cur cus cuu cxc cxf cxi cxr cxs cxx ec- ecc ece ecf eci ecr ecs ecu ecx eec eee eef eer ees eex ef- efc efe eff efi efr efs efx eic eie eif eii eir eis eiu eix erc ere erf eri err ers eru es- esc ese esf esi esr ess esu esx eu- euc eue euf eui eur eus eux ex- exc exe exi exr exs exu exx fcc fce fcf fci fcr fcs fcu fcx fec fee fef fei fer fes feu fex ffc ffe fff ffi ffr ffs ffu ffx fic fie fif fii fir fis fiu fix frc fre frf fri frr frs fru fsc fse fsf fsi fsr fss fsu fsx fue fuf fui fur fus fuu fux fxe fxi fxr fxs fxu fxx i-f icc ice icf ici icr ics icu ie- iec iee ief iei ier ies iex ifc ife iff ifi ifr ifs ifu ifx iic iie iif iii iir iis iiu iix ir- irc ire irf iri irr irs iru irx is- isc ise isf isi isr iss isu iu- iuc iue iui iur ius ixc ixe ixi rcc rce rcf rci rcr rcs rcu rcx re- rec ree ref rei rer res reu rex rfc rfe rff rfi rfr rfs rfu ric rie rif rii rir ris rix rrc rrf rri rrr rrs rru rsc rse rsf rsi rsr rss rsu rsx ruc rue ruf rui rur rus ruu rux rxr rxs scc sce scf sci scr scs scu scx se- sec see sef sei ser ses seu sex sfc sfe sff sfi sfr sfs sfu sfx sic sie sif sii sir sis siu six sr- src sre srf sri srr srs srx ss- ssc sse ssf ssi ssr sss ssu ssx suc sue suf sui sur sus suu sux sxc sxi sxs sxu ucc uce ucf uci ucr ucs ucu uec uee uef uei uer ues ufc ufe uff ufi ufr ufs ufu ufx uic uie uif uii uir uis uiu ur- urc ure urf uri urr urs uru urx usc use usf usi usr uss usu usx uuc uue uur uus uuu uxc uxf uxr uxu xcf xci xcr xcx xee xer xes xeu xex xfe xfs xfx xic xie xii xis xiu xix xrc xrf xrx xsc xsi xss xue xui xus xxi xxx