-er a-a a-i a-t aaa aae aai aap aar aat aax aea aee aei aep aer aet aex ai- aia aie aii aip air ait aix ap- apa ape api app apr apt apx ar- ara are ari arp arr art arx at- ata ate ati atp atr att atx ax- axa axe axi axp axr axt axx eaa eae eai eap ear eat eax eea eee eep eer eet eex eia eie eii eip eir eit eix ep- epa epe epi epp epr ept epx era ere eri erp err ert eta ete eti etp etr ett etx ex- exa exe exi exp exr ext exx ia- iaa iae iai iap iar iat ie- iea iee iei iep ier iet iex iia iie iii iip iir iit iix ipa ipe ipi ipp ipr ipt ipx ir- ira ire iri irp irr irt irx ita ite iti itp itt itx ixe ixi p-p paa pae pai pap par pat pax pea pee pei pep per pet pex pia pie pii pip pir pit pix ppa ppe ppi ppp ppr ppt ppx pra pre pri prp prr prt prx pt- pta pte pti ptp ptr ptt ptx pxe pxr pxt ra- raa rae rai rap rar rat rax re- rea ree rei rep rer ret rex ria rie rii rip rir rit rix rpa rpe rpi rpp rpr rpt rpx rra rri rrp rrr rrt rta rte rti rtp rtr rtt rtx rxp rxr t-x taa tae tai tap tar tat tax te- tea tee tei tep ter tet tex tia tie tii tip tir tit tix tpa tpe tpi tpp tpr tpt tpx tra tre tri trp trr trt trx tta tte tti ttp ttr ttt ttx txe txi txt xaa xap xar xat xee xep xer xet xex xia xie xii xit xix xpa xpe xpp xpt xrt xrx xti xtp xtr xtx xxi xxp xxx