-er ddd dde ddi ddm ddp ddr dds ddx de- ded dee dei dem dep der des dex di- did die dii dim dip dir dis dix dmd dme dmi dmm dmp dmr dms dmx dpd dpe dpi dpm dpp dpr dps drd dre dri drm drp drr drs drx dsd dse dsi dsm dsp dsr dss dsx dxd dxi dxp dxr dxs dxx ed- edd ede edi edm edp edr eds edx eed eee eem eep eer ees eex eid eie eii eim eip eir eis eix em- emd eme emi emm emp emr ems emx ep- epd epe epi epm epp epr eps epx erd ere eri erm erp err ers es- esd ese esi esm esp esr ess esx ex- exd exe exi exp exr exs exx i-d idd ide idi idm idp idr ids idx ie- ied iee iei iem iep ier ies iex iid iie iii iim iip iir iis iix im- imd ime imi imm imp ims imx ipd ipe ipi ipm ipp ipr ips ipx ir- ird ire iri irm irp irr irs irx is- isd ise isi ism isp isr iss ixe ixi m-r mdd mde mdi mdm mdp mdr mds mdx med mee mei mem mep mer mes mex mi- mid mie mii mim mip mir mis mix mmd mme mmi mmm mmp mmr mms mmx mpd mpe mpi mpm mpp mpr mps mpx mrd mre mri mrm mrp mrr mrs mrx msd mse msi msm msp msr mss msx mxd mxi mxp mxr mxs p-p pdd pde pdi pdm pdp pdr pds pdx ped pee pei pem pep per pes pex pid pie pii pim pip pir pis pix pmd pme pmi pmm pmp pmr pms pmx ppd ppe ppi ppm ppp ppr pps ppx prd pre pri prm prp prr prs prx ps- psd pse psi psm psp psr pss psx pxe pxm pxr pxs rdd rde rdi rdm rdp rdr rds rdx re- red ree rei rem rep rer res rex rid rie rii rim rip rir ris rix rmd rme rmi rmm rmp rmr rms rmx rpd rpe rpi rpm rpp rpr rps rpx rrd rri rrm rrp rrr rrs rsd rse rsi rsm rsp rsr rss rsx rxp rxr rxs sdd sde sdi sdm sdp sdr sds se- sed see sei sem sep ser ses sex sid sie sii sim sip sir sis six smd sme smi smm smp smr sms smx spd spe spi spm spp spr sps spx sr- srd sre sri srm srp srr srs srx ss- ssd sse ssi ssm ssp ssr sss ssx sxi sxm sxs xde xdi xdm xdr xds xed xee xem xep xer xes xex xie xii xis xix xmd xmi xmm xmp xmr xms xmx xpd xpe xpm xpp xps xrd xrx xsi xsm xsp xss xxi xxp xxx