-er -ic a-a a-b a-c a-i aaa aab aac aad aae aai aao aar aax ab- aba abb abc abd abe abi abo abr abx ac- aca acb acc acd ace aci aco acr acx ad- ada adb adc add ade adi ado adr adx aea aeb aec aed aee aei aeo aer aex ai- aia aib aic aid aie aii aio air aix aoa aob aoc aod aoe aoi aoo aor aox ar- ara arb arc ard are ari aro arr arx ax- axa axe axi axo axr axx baa bab bac bad bae bai bao bar bax bba bbb bbc bbd bbe bbi bbo bbr bbx bca bcb bcc bcd bce bci bco bcr bcx bda bdb bdc bdd bde bdi bdo bdr bdx be- bea beb bec bed bee bei beo ber bex bi- bia bib bic bid bie bii bio bir bix boa bob boc bod boe boi boo bor box bra brb brd bre bri bro brr brx bxb bxd bxi bxo bxx c-- caa cab cac cad cae cai cao car cax cba cbb cbc cbd cbe cbi cbo cbr cbx cca ccb ccc ccd cce cci cco ccr ccx cda cdb cdc cdd cde cdi cdo cdr cdx ce- cea ceb cec ced cee cei ceo cer cex ci- cia cib cic cid cie cii cio cir cix co- coa cob coc cod coe coi coo cor cox cra crb crc crd cre cri cro crr crx cxc cxi cxo cxr cxx daa dab dac dad dae dai dao dar dax dba dbb dbc dbd dbe dbi dbo dbr dbx dca dcb dcc dcd dce dci dco dcr dcx dda ddb ddc ddd dde ddi ddo ddr ddx de- dea deb dec ded dee dei deo der dex di- dia dib dic did die dii dio dir dix doa dob doc dod doe doi doo dor dox dra drb drc drd dre dri dro drr drx dxc dxd dxi dxo dxr dxx eaa eab eac ead eae eai eao ear eax eba ebb ebc ebd ebe ebi ebo ebr ebx ec- eca ecb ecc ecd ece eci eco ecr ecx ed- eda edb edc edd ede edi edo edr edx eea eeb eec eed eee eeo eer eex eia eib eic eid eie eii eio eir eix eo- eoa eob eoc eod eoe eoi eoo eor era erb erc erd ere eri ero err ex- exa exc exd exe exi exo exr exx i-d ia- iaa iab iac iad iae iai iao iar iba ibb ibc ibd ibe ibi ibo ibr ibx ica icb icc icd ice ici ico icr ida idb idc idd ide idi ido idr idx ie- iea iec ied iee iei ier iex iia iib iic iid iie iii iio iir iix io- ioa iob ioc iod ioe ioi ioo ior ir- ira irb irc ird ire iri iro irr irx ixc ixe ixi o-i oaa oab oac oad oae oai oao oar oax ob- oba obb obc obd obe obi obo obr obx oc- oca ocb occ ocd oci oco ocr ocx oda odb odc odd ode odi odo odr oea oeb oec oed oee oei oeo oer oex oia oib oic oid oie oii oio oir oo- ooa oob ooc ood ooi ooo oor oox or- ora orb orc ord ore ori oro orr orx ox- oxa oxb oxc oxi oxo oxx ra- raa rab rac rad rae rai rao rar rax rba rbb rbc rbd rbe rbi rbo rbr rbx rca rcb rcc rcd rce rci rco rcr rcx rda rdb rdc rdd rde rdi rdo rdr rdx re- rea reb rec red ree rei reo rer rex ria rib ric rid rie rii rio rir rix roa rob roc rod roe roi roo ror rox rra rrb rrc rrd rri rrr rxr xaa xac xad xar xbc xbe xbr xbx xcb xcd xci xcr xcx xda xdb xdc xde xdi xdr xed xee xer xex xia xic xie xii xio xix xoa xoc xod xoi xoo xor xox xrc xrd xrx xxi xxo xxx