-er b-u bbb bbc bbe bbk bbn bbr bbu bcb bcc bce bck bcn bcr bcu bcv be- beb bec bee bek ben ber beu bev bkb bkc bke bkk bkn bkr bkv bnb bnc bne bnk bnn bnr bnu bnv brb bre brk brn brr bru brv bub buc bue buk bun bur buu bvb bvc bve bvk bvn bvr bvu bvv c-- cbb cbc cbe cbk cbn cbr cbu cbv ccb ccc cce cck ccn ccr ccu ccv ce- ceb cec cee cek cen cer ceu cev ckb ckc cn- cnb cnc cne cnn cnr cnu cnv crb crc cre crk crn crr cru crv cub cuc cue cuk cun cur cuu cuv cvb cvc cve cvk cvn cvr cvu cvv ebb ebc ebe ebk ebn ebr ebu ebv ec- ecb ecc ece eck ecn ecr ecu ecv eeb eec eee eek een eer eev ekb ekc eke ekr eku ekv en- enb enc ene enk enn enr enu env erb erc ere erk ern err eru erv eu- eub euc eue eun eur euv evb evc eve evn evr evv kbb kbc kbe kbk kbn kbr kbu kcb kcc kce kck kcn kcr kcu ke- keb kec kee kek ken ker kev kkb kkc kke kkk kkn kkr kku kkv kn- knc kne knk knn knr knu krc krk krn krr kru krv kub kuc kue kuk kun kur kuu kvb kvk kvn kvr kvv nbb nbc nbe nbk nbn nbr nbu nbv ncb ncc nce nck ncn ncr ncu ncv ne- neb nec nee nek nen ner neu nev nkc nke nkk nkn nkr nku nnb nnc nne nnk nnn nnu nnv nrb nrc nre nrk nrn nrr nru nrv nub nuc nue nuk nun nur nuu nuv nvb nvc nve nvk nvn nvu nvv rbb rbc rbe rbk rbn rbr rbu rcb rcc rce rcn rcr rcu rcv re- reb rec ree rek ren rer reu rev rkb rkc rke rkk rku rkv rnb rnc rnn rnr rnu rnv rrb rrc rrk rrn rrr rru rub ruc rue ruk run rur ruu ruv rvb rvc rve rvn rvr rvu rvv ubb ubc ube ubk ubn ubr ubu ubv ucb ucc uce uck ucn ucr ucu ucv ueb uec uee uen uer ukb ukc uke ukk ukn ukr uku un- unb unc une unk unn unr unu unv ur- urb urc ure urk urn urr uru uuc uue uun uur uuu uvb uvc uve uvu uvv v-e vbc vbk vbr vbv vcc vce vcn vcr vcu veb vec vee vek ven ver veu vkb vn- vnr vnu vnv vrb vrc vre vrk vrn vrr vru vue vuk vur vuv vvb vvc vvr vvv