-er a-a aaa aad aae aan aap aar aax ad- ada add ade adn adp adr adx aea aed aee aen aep aer aex an- ana and ane ann anp anr anx ap- apa apd ape apn app apr apx ar- ara ard are arn arp arr arx ax- axa axe axn axp axr axx daa dad dae dan dap dar dax dda ddd dde ddn ddp ddr ddx de- dea ded dee den dep der dex dna dnd dne dnn dnp dnr dpa dpd dpe dpn dpp dpr dra drd dre drn drp drr drx dxd dxn dxp dxr dxx eaa ead eae ean eap ear eax ed- eda edd ede edn edp edr edx eea eed eee een eep eer eex en- ena end ene enn enp enr ep- epa epd epe epn epp epr epx era erd ere ern erp err ex- exa exd exe exp exr exx naa nad nae nan nap nar nax nda ndd nde ndn ndp ndr ne- nea ned nee nen nep ner nex nna nne nnn nnp npa npd npe npn npp npr nra nrd nre nrn nrp nrr nrx nxd p-p paa pad pae pan pap par pax pda pdd pde pdn pdp pdr pdx pea ped pee pen pep per pex pn- pna pnd pne pnn pnp pnr pnx ppa ppd ppe ppn ppp ppr ppx pra prd pre prn prp prr prx pxe pxr ra- raa rad rae ran rap rar rax rda rdd rde rdn rdp rdr rdx re- rea red ree ren rep rer rex rna rnd rnn rnp rnr rpa rpd rpe rpn rpp rpr rpx rra rrd rrn rrp rrr rxp rxr xaa xad xan xap xar xda xde xdr xed xee xen xep xer xex xna xpa xpd xpe xpn xpp xrd xrx xxp xxx