-er -th eee eeo eer eet eex ehe ehh eho ehr eht eo- eoe eoh eoo eor eot ere erh ero err ert ete eth eto etr ett etx ex- exe exh exo exr ext exx he- hee heh heo her het hex hhe hhh hho hhr hht hoe hoh hoo hor hot hox hr- hre hrh hro hrr hrt hte hth hto htr htt htx oee oeh oeo oer oet oex ohe ohh oho ohr oht oo- ooh ooo oor oot oox or- ore orh oro orr ort orx ot- ote oth oto otr ott ox- oxo oxt oxx re- ree reh reo rer ret rex rh- rhe rhh rho rhr rht roe roh roo ror rot rox rrh rrr rrt rte rto rtr rtt rtx rxr t-x te- tee teh teo ter tet tex th- the thh tho thr tht thx to- toe toh too tor tot tox tre trh tro trr trt trx tte tth tto ttr ttt ttx txe txt xee xer xet xex xht xoo xor xot xox xrt xrx xtr xtx xxo xxx