-ic a-a a-b a-c a-i aaa aab aac aai aak aam aan aar ab- aba abb abc abi abk abm abn abr ac- aca acb acc aci ack acm acn acr ai- aia aib aic aii aik aim ain air aka akb akc aki akk akm akn akr ama amb amc ami amk amm amn amr an- ana anb anc ani ank anm ann anr ar- ara arb arc ari ark arm arn arr baa bab bac bai bak bam ban bar bba bbb bbc bbi bbk bbm bbn bbr bca bcb bcc bci bck bcm bcn bcr bi- bia bib bic bii bik bim bin bir bka bkb bkc bkk bkm bkn bkr bma bmb bmc bmi bmk bmm bmn bmr bna bnb bnc bni bnk bnn bnr bra brb bri brk brm brn brr c-- caa cab cac cai cak cam can car cba cbb cbc cbi cbk cbm cbn cbr cca ccb ccc cci cck ccm ccn ccr ci- cia cib cic cii cik cim cin cir cka ckb ckc cki ckm cma cmb cmc cmi cmk cmm cmn cmr cn- cna cnb cnc cni cnm cnn cnr cra crb crc cri crk crm crn crr ia- iaa iab iac iai iam ian iar iba ibb ibc ibi ibk ibm ibn ibr ica icb icc ici ick icm icn icr iia iib iic iii iim iin iir ika ikb ikc iki ikk ikr im- ima imb imc imi imm imn in- ina inb inc ini ink inm inn inr ir- ira irb irc iri irk irm irn irr ka- kaa kab kac kai kak kam kan kar kba kbb kbc kbi kbk kbm kbn kbr kca kcb kcc kci kck kcm kcn kcr kia kib kic kii kik kim kin kir kkb kkc kki kkk kkm kkn kkr kma kmb kmc kmi kmk kmm kn- kna knc kni knk knm knn knr kra krc kri krk krn krr m-r maa mab mac mai mak mam man mar mba mbb mbc mbi mbk mbm mbr mc- mca mcb mcc mci mck mcm mcn mcr mi- mia mib mic mii mik mim min mir mka mkb mkc mkk mkm mkn mkr mma mmb mmc mmi mmk mmm mmn mmr mna mnb mnc mni mnk mnm mnn mnr mra mrb mrc mri mrk mrm mrn mrr n-i naa nab nac nai nak nam nan nar nba nbb nbc nbi nbk nbm nbn nbr nca ncb ncc nci nck ncm ncn ncr nia nib nic nii nik nim nin nir nka nkc nki nkk nkm nkn nkr nma nmb nmc nmi nmk nmm nmn nmr nna nnb nnc nni nnk nnm nnn nra nrb nrc nri nrk nrm nrn nrr ra- raa rab rac rai rak ram ran rar rba rbb rbc rbi rbk rbm rbn rbr rca rcb rcc rci rcm rcn rcr ria rib ric rii rik rim rin rir rkb rkc rkk rkm rma rmb rmc rmi rmm rmn rmr rna rnb rnc rni rnm rnn rnr rra rrb rrc rri rrk rrm rrn rrr