-er -up ddd dde ddi ddp ddr ddu ddx de- ded dee dei dep der deu dex di- did die dii dip dir diu dix dpd dpe dpi dpp dpr dpu drd dre dri drp drr dru drx dud due dui dup dur dux dxd dxi dxp dxr dxx ed- edd ede edi edp edr edu edx eed eee eep eer eex eid eie eii eip eir eiu eix ep- epd epe epi epp epr epu epx erd ere eri erp err eru eu- eud eue eui eup eur eux ex- exd exe exi exp exr exu exx i-d idd ide idi idp idr idu idx ie- ied iee iei iep ier iex iid iie iii iip iir iiu iix ipd ipe ipi ipp ipr ipu ipx ir- ird ire iri irp irr iru irx iu- iud iue iui iup iur ixe ixi p-p pdd pde pdi pdp pdr pdu pdx ped pee pei pep per peu pex pid pie pii pip pir piu pix ppd ppe ppi ppp ppr ppu ppx prd pre pri prp prr pru prx pud pue pui pup pur puu pxe pxr rdd rde rdi rdp rdr rdu rdx re- red ree rei rep rer reu rex rid rie rii rip rir rix rpd rpe rpi rpp rpr rpu rpx rrd rri rrp rrr rru rud rue rui rup rur ruu rux rxp rxr udd ude udi udp udr udu udx ued uee uei uep uer uid uie uii uip uir uiu up- upd upe upi upp upr upu upx ur- urd ure uri urp urr uru urx uue uur uuu uxr uxu xde xdi xdr xed xee xep xer xeu xex xie xii xiu xix xpd xpe xpp xrd xrx xue xui xup xxi xxp xxx