a-a a-b a-c aaa aab aac aad aae aak aaw aax ab- aba abb abc abd abe abk abw abx ac- aca acb acc acd ace ack acw acx ad- ada adb adc add ade adk adw adx aea aeb aec aed aee aek aew aex aka akb akc akd ake akk akw aw- awa awb awc awd awe awk aww ax- axa axe axk axx baa bab bac bad bae bak baw bax bba bbb bbc bbd bbe bbk bbw bbx bca bcb bcc bcd bce bck bcx bda bdb bdc bdd bde bdk bdw bdx be- bea beb bec bed bee bek bew bex bka bkb bkc bke bkk bkw bkx bwa bwb bwc bwd bwk bxb bxd bxw bxx c-- caa cab cac cad cae cak caw cax cba cbb cbc cbd cbe cbk cbw cbx cca ccb ccc ccd cce cck ccw ccx cda cdb cdc cdd cde cdk cdw cdx ce- cea ceb cec ced cee cek cew cex cka ckb ckc ckd ckw ckx cw- cwa cwb cwc cwd cwe cwk cxc cxk cxx daa dab dac dad dae dak daw dax dba dbb dbc dbd dbe dbk dbx dca dcb dcc dcd dce dck dcw dcx dda ddb ddc ddd dde ddk ddw ddx de- dea deb dec ded dee dek dew dex dka dkb dkc dke dkk dkw dkx dwa dwb dwc dwe dww dwx dxc dxd dxx eaa eab eac ead eae eak eaw eax eba ebb ebc ebd ebe ebk ebw ebx ec- eca ecb ecc ecd ece eck ecw ecx ed- eda edb edc edd ede edk edw edx eea eeb eec eed eee eek eew eex eka ekb ekc ekd eke ewa ewb ewc ewd ewe ewk eww ex- exa exc exd exe exw exx ka- kaa kab kac kad kae kak kaw kax kba kbb kbc kbd kbe kbk kbw kbx kca kcb kcc kcd kce kck kcx kda kdb kdc kde kdk kdx ke- kea keb kec ked kee kek kew kex kkb kkc kke kkk kw- kwa kwc kwd kwk kww waa wab wac wad wae wak waw wax wba wbb wbc wbd wbe wbw wbx wca wcb wcc wcd wce wck wcw wcx wda wdb wdc wea web wec wed wee wek wew wex wka wkb wkc wkd wke wkw wwa wwc wwd wwe www wxc wxw xaa xac xad xak xbc xbe xbx xcb xcd xcx xda xdb xdc xde xdk xed xee xew xex xkb xke xwa xwd xxx