aaaa aaab aaac aaad aaal aaap aaba aabb aabc aabd aabl aabp aaca aacb aacc aacd aacl aacp aada aadc aala aalc aald aall aapa aapc aapl abaa abab abac abad abal abap abb- abba abbb abca abcb abcc abcd abcl abcp abda abla abpa abpc abpd abpp acaa acab acac acad acap acba acbl acca accc accd accp acda acdb acdc acdp acla aclc acpa acpd adaa adab adac adad adal adap adba adbc adcc adda addc addd addl adp- al-p alaa alac alad alal alap alb- alba albc alca alcc ald- alda aldl all- alla alll alpa alpl apac apal apap apba apca apcb apcc apcd apda apdd apl- apla aplp appa appc appd appl baaa baad baal baba babb bac- baca bacc bada badb badd bala balc bald ball bapa bapc bapp bbad bbbb bbdd bblb bcaa bcap bcbc bcbp bcca bccc bccl bcda bcpl bcpp bdbc bddc bdpc blaa blab blac blad bldc bpcp bpda c-cd caaa caab caac caal caap caba cac- caca cacc cada cadc cadd cala calc cald call calp capa capb capc capd capp cbac cbal cbbc cbca cbcc cbcl cbcp cbdb cbdc cblb cblc cbpc cbpp ccaa ccab ccac ccad ccap ccba ccbc ccca cccb cccc cccl cccp ccdc ccdp ccla cclc ccpa ccpl ccpp cdaa cdac cdad cdba cdda cddb cddl clab clad clap clcd cldc clpb clpp cpaa cpac cpad cpap cpbc cpca cpdl cplc cppa cppd daab daad daal daap daba dabb dabp daca dada dala dall dapa dapp dbcc dbcp dblp dbpc dbpd dcbc dcca dccb dccc dccl dccp dcdb dcpl dddd ddlc dlab dlbd dpaa dpac dpbc dpcp dpll dppa dppc laaa laac laad laal laap laba laca lacc lacl lacp lada ladd ladp lala lald lall lapa lapb lapc lapd lapp lbcc lcac lcad lcbc lcca lccc lcdd lcdp lcpa lcpc lcpd lcpl lddp ldpc llcc lldb lldc lldp lllc llll lpac lpda lpla lppl paal paap paba paca pacd pada padd pala pall palp papa papb papp pbac pbcc pbpa pcaa pcad pcap pcba pcbc pcca pccc pccl pcll pcpb pcpp pdac pdca pdcp pdlc pdpa plaa plab plac plad plap plcc plpa plpp ppac ppad ppal ppap ppcc ppcd pppa pppd pppp