-er -ic a-a a-c a-i a-t aaa aac aae aai aar aat aax ac- aca acc ace aci acr act acx aea aec aee aei aer aet aex ai- aia aic aie aii air ait aix ar- ara arc are ari arr art arx at- ata atc ate ati atr att atx ax- axa axe axi axr axt axx c-- caa cac cae cai car cat cax cca ccc cce cci ccr cct ccx ce- cea cec cee cei cer cet cex ci- cia cic cie cii cir cit cix cra crc cre cri crr crt crx cta ctc cte cti ctr ctt ctx cxc cxi cxr cxt cxx eaa eac eae eai ear eat eax ec- eca ecc ece eci ecr ect ecx eea eec eee eer eet eex eia eic eie eii eir eit eix era erc ere eri err ert eta etc ete eti etr ett etx ex- exa exc exe exi exr ext exx ia- iaa iac iae iai iar iat ica icc ice ici icr ict ie- iea iec iee iei ier iet iex iia iic iie iii iir iit iix ir- ira irc ire iri irr irt irx ita itc ite iti itt itx ixc ixe ixi ra- raa rac rae rai rar rat rax rca rcc rce rci rcr rct rcx re- rea rec ree rei rer ret rex ria ric rie rii rir rit rix rra rrc rri rrr rrt rta rtc rte rti rtr rtt rtx rxr t-x taa tac tae tai tar tat tax tca tcc tce tci tcr tct tcx te- tea tec tee tei ter tet tex tia tic tie tii tir tit tix tra trc tre tri trr trt trx tta ttc tte tti ttr ttt ttx txe txi txt xaa xac xar xat xci xcr xcx xee xer xet xex xia xic xie xii xit xix xrc xrt xrx xtc xti xtr xtx xxi xxx