-er eee een eep eer eet eex eie eii ein eip eir eit eix en- ene eni enn enp enr ent ep- epe epi epn epp epr ept epx ere eri ern erp err ert ete eti etn etp etr ett etx ex- exe exi exp exr ext exx ie- iee iei ien iep ier iet iex iie iii iin iip iir iit iix in- ine ini inn inp inr int inx ipe ipi ipn ipp ipr ipt ipx ir- ire iri irn irp irr irt irx ite iti itn itp itt itx ixe ixi ixn n-i ne- nee nei nen nep ner net nex nie nii nin nip nir nit nix nne nni nnn nnp nnt npe npi npn npp npr npt nre nri nrn nrp nrr nrt nrx nte nti ntn ntp ntr ntt ntx nxt p-p pee pei pen pep per pet pex pie pii pin pip pir pit pix pn- pne pni pnn pnp pnr pnt pnx ppe ppi ppn ppp ppr ppt ppx pre pri prn prp prr prt prx pt- pte pti ptn ptp ptr ptt ptx pxe pxr pxt re- ree rei ren rep rer ret rex rie rii rin rip rir rit rix rni rnn rnp rnr rnt rpe rpi rpn rpp rpr rpt rpx rri rrn rrp rrr rrt rte rti rtn rtp rtr rtt rtx rxp rxr t-x te- tee tei ten tep ter tet tex tie tii tin tip tir tit tix tne tni tnn tnp tnr tnt tnx tpe tpi tpn tpp tpr tpt tpx tre tri trn trp trr trt trx tte tti ttn ttp ttr ttt ttx txe txi txn txt xee xen xep xer xet xex xie xii xin xit xix xpe xpn xpp xpt xrt xrx xti xtp xtr xtx xxi xxp xxx