-er -up ddd dde ddi ddp ddq ddr ddu de- ded dee dei dep deq der deu di- did die dii dip diq dir diu dpd dpe dpi dpp dpr dpu dqe drd dre dri drp drq drr dru dud due dui dup dur ed- edd ede edi edp edr edu eed eee eep eer eid eie eii eip eir eiu ep- epd epe epi epp epq epr epu eqe eqp eqq equ erd ere eri erp erq err eru eu- eud eue eui eup eur i-d idd ide idi idp idq idr idu ie- ied iee iei iep ier iid iie iii iip iir iiu ipd ipe ipi ipp ipr ipu iqd iqe iqu ir- ird ire iri irp irq irr iru iu- iud iue iui iup iur p-p pdd pde pdi pdp pdq pdr pdu ped pee pei pep per peu pid pie pii pip piq pir piu ppd ppe ppi ppp ppq ppr ppu pqi pqq pqr prd pre pri prp prq prr pru pud pue pui pup pur puu qdr qed qee qep qid qie qip qir qiu qpp qpr qqq qqu qre qri qrp qru qu- qud que qui qur rdd rde rdi rdp rdr rdu re- red ree rei rep req rer reu rid rie rii rip riq rir rpd rpe rpi rpp rpr rpu rrd rri rrp rrq rrr rru rud rue rui rup rur ruu udd ude udi udp udr udu ued uee uei uep uer uid uie uii uip uiq uir uiu up- upd upe upi upp upr upu ur- urd ure uri urp urr uru uue uur uuu