-er -ic a-a a-c a-i a-t aaa aac aae aai aap aar aat aax ac- aca acc ace aci acp acr act acx aea aec aee aei aep aer aet aex ai- aia aic aie aii aip air ait aix ap- apa apc ape api app apr apt apx ar- ara arc are ari arp arr art arx at- ata atc ate ati atp atr att atx ax- axa axe axi axp axr axt axx c-- caa cac cae cai cap car cat cax cca ccc cce cci ccp ccr cct ccx ce- cea cec cee cei cep cer cet cex ci- cia cic cie cii cip cir cit cix cpa cpc cpe cpi cpp cpr cpt cpx cra crc cre cri crp crr crt crx cta ctc cte cti ctp ctr ctt ctx cxc cxi cxp cxr cxt cxx eaa eac eae eai eap ear eat eax ec- eca ecc ece eci ecr ect ecx eea eec eee eep eer eet eex eia eic eie eii eip eir eit eix ep- epa epc epe epi epp epr ept epx era erc ere eri erp err ert eta etc ete eti etp etr ett etx ex- exa exc exe exi exp exr ext exx ia- iaa iac iae iai iap iar iat ica icc ice ici icp icr ict ie- iea iec iee iei iep ier iet iex iia iic iie iii iip iir iit iix ipa ipc ipe ipi ipp ipr ipt ipx ir- ira irc ire iri irp irr irt irx ita itc ite iti itp itt itx ixc ixe ixi p-p paa pac pae pai pap par pat pax pca pcc pce pci pcp pcr pct pcx pea pec pee pei pep per pet pex pia pic pie pii pip pir pit pix ppa ppc ppe ppi ppp ppr ppt ppx pra prc pre pri prp prr prt prx pt- pta ptc pte pti ptp ptr ptt ptx pxc pxe pxr pxt ra- raa rac rae rai rap rar rat rax rca rcc rce rci rcp rcr rct rcx re- rea rec ree rei rep rer ret rex ria ric rie rii rip rir rit rix rpa rpc rpe rpi rpp rpr rpt rpx rra rrc rri rrp rrr rrt rta rtc rte rti rtp rtr rtt rtx rxp rxr t-x taa tac tae tai tap tar tat tax tca tcc tce tci tcp tcr tct tcx te- tea tec tee tei tep ter tet tex tia tic tie tii tip tir tit tix tpa tpc tpe tpi tpp tpr tpt tpx tra trc tre tri trp trr trt trx tta ttc tte tti ttp ttr ttt ttx txe txi txt xaa xac xap xar xat xci xcp xcr xcx xee xep xer xet xex xia xic xie xii xit xix xpa xpc xpe xpp xpt xrc xrt xrx xtc xti xtp xtr xtx xxi xxp xxx