aaaa aaab aaac aaad aaap aaba aabb aabc aabd aabp aaca aacb aacc aacd aacp aada aadc aapa aapc abaa abab abac abad abap abb- abba abbb abca abcb abcc abcd abcp abda abpa abpc abpd abpp acaa acab acac acad acap acba acca accc accd accp acda acdb acdc acdp acpa acpd adaa adab adac adad adap adba adbc adcc adda addc addd adp- adq- apac apap apba apca apcb apcc apcd apda apdd appa appc appd aqap aqda baaa baad baba babb bac- baca bacc bada badb badd bapa bapc bapp baqa bbad bbbb bbbq bbdd bcaa bcap bcbc bcbp bcca bccc bcda bcpp bdbc bddc bdpc bpcp bpda c-cd caaa caab caac caap caba cac- caca cacc cada cadc cadd capa capb capc capd capp cbac cbbc cbca cbcc cbcp cbdb cbdc cbpc cbpp ccaa ccab ccac ccad ccap ccba ccbc ccca cccb cccc cccp ccdc ccdp ccpa ccpp cdaa cdac cdad cdba cdda cddb cpaa cpac cpad cpap cpbc cpca cppa cppd daab daad daap daba dabb dabp daca dada dapa dapp dbcc dbcp dbpc dbpd dcbc dcca dccb dccc dccp dcdb dddd dpaa dpac dpbc dpcp dppa dppc dqcd dqdb paap paba paca pacd pada padd papa papb papp pbac pbcc pbpa pcaa pcad pcap pcba pcbc pcca pccc pcpb pcpp pdac pdca pdcp pdpa ppac ppad ppap ppcc ppcd pppa pppd pppp pqcc qa-c qada qcad qppb qqqq