RESTIFFNESS

ef en er es et fe if in is it ne re si ti

eff efs eft ens ere ern ers ess fee fen fer fes fet fie fin fir fit iff ifs ins ire its nee net nit ree ref rei res ret rif rin see sei sen ser set sin sir sis sit sri tee ten tie tin tis

effs efts erne erns erst eses esne fees feet fens fere fern fess fest fete fets fief fife fine fins fire firn firs fist fits free fret frit ires neif ness nest nets nite nits reef rees refs reft reif rein reis rent rest rete rets rife riff rifs rift rins rise rite seen seer sees seif seis sene sent sere serf sers sets sift sine sins sire sirs site sits snit sris stir teen tees teff tens tern tier ties tiff tine tins tire tree tref tres