aaaa aaac aaad aaaf aaca aacc aacd aacf aact aada aadc aadt aafa aafc aafd aaff aata aatc aatf aatt ac-t acaa acac acad acat acca accc accd accf acct acda acdc acdf acdt acfc acfd acft acta actc actf actt adaa adac adad adat adcc adda addc addd adfa adfc adta afaa afad afat afca afcc afdc affa affc afft afta aftc at-t ataa atac atad atat atca atcc atcf atdt atfc atta c-cd caaa caac caaf caat cac- caca cacc cada cadc cadd cafa cafc caff cat- cata catc catd catf catt ccaa ccac ccad ccaf ccat ccca cccc cccf ccdc ccdf ccfa ccfc ccfd ccff cctc cctt cdaa cdac cdad cdda cdfa cfaa cfac cfca cfcf cfda cfta cftc ctca ctcf ctfc ctta daad daca dact dada dafa dafc daff daft data datt dcca dccc dcct dcfc dctc dddd dfaf dfcc dfdt dffa dtaa dtac dtcc dtfc faaa faac faad faca facc fact fada fadd fafa fafc faff fata fatc fatf fatt fcat fcca fccf fcda fdca fdtc ffcc ffff fftf ft-c ftcd ftfc taa- taaf taat taca tacc tact tada tafa tafc taff taft tata tatt tcad tcca tccc tcdd tcfc tctc tdac tdff tfca tfdc tftc ttfa ttfc ttff tttt