-ic a-a a-b a-c a-i aaa aab aac aaf aai aao aar ab- aba abb abc abf abi abo abr ac- aca acb acc acf aci aco acr af- afa afb afc aff afi afo afr ai- aia aib aic aif aii aio air aoa aob aoc aof aoi aoo aor ar- ara arb arc arf ari aro arr baa bab bac baf bai bao bar bba bbb bbc bbf bbi bbo bbr bca bcb bcc bcf bci bco bcr bfa bfb bfc bff bfi bfo bfr bi- bia bib bic bif bii bio bir boa bob boc bof boi boo bor bra brb brf bri bro brr c-- caa cab cac caf cai cao car cba cbb cbc cbf cbi cbo cbr cca ccb ccc ccf cci cco ccr cfa cfb cfc cff cfi cfo cfr ci- cia cib cic cif cii cio cir co- coa cob coc cof coi coo cor cra crb crc crf cri cro crr faa fab fac faf fai fao far fba fbb fbc fbf fbi fbo fbr fca fcb fcc fcf fci fco fcr ffa ffc fff ffi ffo ffr fia fib fic fif fii fir foa fob foc fof foi foo for fra frb frc frf fri fro frr i-f ia- iaa iab iac iaf iai iao iar iba ibb ibc ibf ibi ibo ibr ica icb icc icf ici ico icr ifa ifb ifc iff ifi ifo ifr iia iib iic iif iii iio iir io- ioa iob ioc iof ioi ioo ior ir- ira irb irc irf iri iro irr o-i oaa oab oac oaf oai oao oar ob- oba obb obc obf obi obo obr oc- oca ocb occ ocf oci oco ocr of- ofa ofb ofc off ofi ofo ofr oia oib oic oif oii oio oir oo- ooa oob ooc oof ooi ooo oor or- ora orb orc orf ori oro orr ra- raa rab rac raf rai rao rar rba rbb rbc rbf rbi rbo rbr rca rcb rcc rcf rci rco rcr rfa rfb rfc rff rfi rfo rfr ria rib ric rif rii rio rir roa rob roc rof roi roo ror rra rrb rrc rrf rri rrr

a-ii aaaa aaab aaac aaaf aaai aaar aaba aabb aabc aabi aaca aacb aacc aacf aaci aaco aacr aafa aafb aafc aaff aafi aaib aaic aaii aaoo aara aarc aari aaro abaa abab abac abaf abai abar abb- abba abbb abbi abbo abbr abca abcb abcc abcf abci abcr abff abia abib abic abir aboa abob abof aboo abor abra abrc abri abro acaa acab acac acai acar acba acca accc accf acci acco acfc acfi aci- acia acic acif acir acoa acor acr- acra acrc acri acro acrr afaa afao afar afca afcb afcc afci affa affc affi affo afia afib afif afir afoa afoo afor afr- afra afrc afri afro aiai aiba aibo aica aicc aicf aicr aiff aiia aiib aiic aiir aioc aioi aira airi airo aoba aoca aora aorb arab arac araf arai arar arba arbi arc- arca arci arco arfa arfb arfc arff aria arib arif arii ario aroa arob aroi aroo aror arr- arra arrc arri arro arrr ba-i baaa baaf baar baba babb babi babo babr bac- baca bacc baci baco bafc baff bafo baia baib baic baio bair bar- bara barb barc barf bari baro barr bbbb bbci bbfc bbrc bcaa bcar bcbc bcca bccc bcci bcfc bcia bcof bcor bcra bfca biaf biao biar biba bibb bibi bibo bica bicc bici bico bifa biff bifi bio- bioc bioi bira birb biri biro birr boab boac boai boar boba bobb bobi bobo boca boco bofa boff boi- boii boob booc boof boor bor- bora borf bori boro borr brab brac braf brai brao brca brcb brfc bria bric brio broa brob broc broo bror brrr c-bo caaa caab caac caaf caba cabf cabi cabo cac- caca cacc caci caco cacr cafa cafb cafc caff caia caib caic caio cair caoi caor cara carb carc carf cari caro carr cbac cbar cbbc cbca cbcc cbcr cbfb cbfc cbia cbir ccaa ccab ccac ccaf ccai ccar ccba ccbc ccca cccb cccc cccf ccci ccfa ccfc ccff ccfi ccic ccii ccir ccob ccoc ccra ccrc ccrf ccri cfaa cfab cfac cfao cfar cfbc cfbr cfca cfcb cfcf cfco cffb cffr cfia cfoa cfor cfra cfrb ciaa ciao ciar ciba cibc cibi cibo cica cicc cici cico cicr cifa ciff ciia ciii ciob cior cira cirb circ ciri ciro cirr coai coba cobb cobi cobo coca coco cofc coff cofi coia coif coir coob coof cor- cora corb corc corf cori coro corr crab crac craf crai crar crbc crca crcc crcr crfc cria crib cric crif crob croc croo cror faaa faac faba fabi fabo faca facc fafa fafc faff fafi fafo faio fair fara farb farc faro farr fbar fcab fcar fcba fcca fccf fcic fcii fcra ffar ffcc ffff ffii ffrr fiaa fiac fiaf fiar fiba fica ficc fico fifa fifc fiff fifi fifo fiii fior fira foaf foar foba foca foci foco fofo foia foof for- fora forb fori foro forr frab frac frbc frcc frfc fria frib fric frio frob iaaa iaac iaai iaba iaca iacc iacr iafc iaff iaia iara iarc ibac ibar ibca ibfi ibia ibra ibrc ibri ibro icaa icab icac icaf icai icao icar icbc icca iccb iccc iccf icci icco iccr icfb icoc icor icra icrc icrf icrr ifaa ifac ifao ifar ifbb ifco ific ifor ifra ifrb ifrf ifri iiac iica iifa iiii iiio iioi iioo iira iirc ioba iobi ioci iofc ioii ioio ioof iooi iooo iora iori irac iraf irai irao irar irca ircc iri- iria iric irio irob iroc irra irrc irri oafc oafo oaic oara obai obba obbo obia oboi obor obra obri obro ocab ocac ocbc occa occc occi ocfa ocra ocro ocrr ofcr off- offa offc offo offr ofor ofra oiba oici oiii oira ooaa ooba oobi oocr ooff ooia oooo oora orab orac orai