a-a a-b a-c a-q aaa aab aac aae aak aan aaq aas ab- aba abb abc abe abk abn abq abs ac- aca acb acc ace ack acn acq acs aea aeb aec aee aek aen aeq aes aka akb akc ake akk akn aks an- ana anb anc ane ank ann anq ans aqa aqc aqn aqs as- asa asb asc ase ask asn asq ass baa bab bac bae bak ban baq bas bba bbb bbc bbe bbk bbn bbq bbs bca bcb bcc bce bck bcn bcq bcs be- bea beb bec bee bek ben beq bes bka bkb bkc bke bkk bkn bkq bks bna bnb bnc bne bnk bnn bns bqc bqe bsa bsb bsc bse bsk bsn bss c-- caa cab cac cae cak can caq cas cba cbb cbc cbe cbk cbn cbq cbs cca ccb ccc cce cck ccn ccs ce- cea ceb cec cee cek cen ceq ces cka ckb ckc cks cn- cna cnb cnc cne cnn cns cqa cqb cqc cqs csa csb csc cse csk csn csq css eaa eab eac eae eak ean eas eba ebb ebc ebe ebk ebn ebq ebs ec- eca ecb ecc ece eck ecn ecq ecs eea eeb eec eee eek een ees eka ekb ekc eke eks en- ena enb enc ene enk enn ens eqa eqe eqn eqq eqs es- esa esb esc ese esk esn esq ess ka- kaa kab kac kae kak kan kas kba kbb kbc kbe kbk kbn kbs kca kcb kcc kce kck kcn kcs ke- kea keb kec kee kek ken kes kkb kkc kke kkk kkn kks kn- kna knc kne knk knn kqa ksa ksb ksc kse ksk ksn kss naa nab nac nae nak nan nas nba nbb nbc nbe nbk nbn nbs nca ncb ncc nce nck ncn ncs ne- nea neb nec nee nek nen nes nka nkc nke nkk nkn nks nna nnb nnc nne nnk nnn nns nqc nqs nsa nsb nsc nse nsk nsn nss qaa qac qan qas qba qbc qbe qbq qbs qca qcc qcs qec qee qen qnb qne qnk qns qqk qqq qsa qsc saa sab sac sae sak san saq sas sba sbb sbc sbe sbk sbn sbq sbs sca scb scc sce sck scn scs se- sea seb sec see sek sen seq ses sk- ska skb skc ske skk skq sks sna snb snc sne snk snn sns sqa sqn sqq sqs ss- ssa ssb ssc sse ssk ssn ssq sss