-al -ic a-a a-b a-c a-i aaa aab aac aaf aai aak aal aar ab- aba abb abc abf abi abk abl abr ac- aca acb acc acf aci ack acl acr af- afa afb afc aff afi afk afl afr ai- aia aib aic aif aii aik ail air aka akb akc aki akk akl akr al- ala alb alc alf ali alk all alr ar- ara arb arc arf ari ark arl arr baa bab bac baf bai bak bal bar bba bbb bbc bbf bbi bbk bbl bbr bca bcb bcc bcf bci bck bcl bcr bfa bfb bfc bff bfi bfl bfr bi- bia bib bic bif bii bik bil bir bka bkb bkc bkf bkk bkl bkr bla blb blc blf bli blk bll blr bra brb brf bri brk brl brr c-- caa cab cac caf cai cak cal car cba cbb cbc cbf cbi cbk cbl cbr cca ccb ccc ccf cci cck ccl ccr cfa cfb cfc cff cfi cfk cfl cfr ci- cia cib cic cif cii cik cil cir cka ckb ckc cki cl- cla clb clc clf cli clk cll clr cra crb crc crf cri crk crl crr faa fab fac faf fai fak fal far fba fbb fbc fbf fbi fbk fbl fbr fca fcb fcc fcf fci fck fcl fcr ffa ffc fff ffi ffk ffl ffr fia fib fic fif fii fik fil fir fka fkb fkc fkf fki fkk fkl fla flb flc flf fli fll flr fra frb frc frf fri frk frl frr i-f ia- iaa iab iac iaf iai ial iar iba ibb ibc ibf ibi ibk ibl ibr ica icb icc icf ici ick icl icr ifa ifb ifc iff ifi ifl ifr iia iib iic iif iii iil iir ika ikb ikc ikf iki ikk ikl ikr il- ila ilb ilc ilf ili ilk ill ilr ir- ira irb irc irf iri irk irl irr ka- kaa kab kac kaf kai kak kal kar kba kbb kbc kbf kbi kbk kbl kbr kca kcb kcc kci kck kcl kcr kfa kfc kff kfi kia kib kic kif kii kik kil kir kkb kkc kki kkk kkl kkr kl- kla klb klc klf kli klr kra krc krf kri krk krl krr la- laa lab lac laf lai lak lal lar lba lbb lbc lbf lbi lbk lbl lbr lca lcb lcc lcf lci lck lcl lcr lfa lfb lfc lff lfi lfk lfl lfr lia lib lic lif lii lik lil lir lka lkb lkl lkr lla llb llc llf lli llk lll llr lra lrb lrc lrf lri lrk lrr ra- raa rab rac raf rai rak ral rar rba rbb rbc rbf rbi rbk rbl rbr rca rcb rcc rcf rci rcl rcr rfa rfb rfc rff rfi rfk rfl rfr ria rib ric rif rii rik ril rir rkb rkc rkf rkk rla rlc rlf rli rll rlr rra rrb rrc rrf rri rrk rrl rrr