ar:park,arch,bark,car,dart,farm,garbage,harm,jar,karma,lard,Mars,party,tarp,yard
ur:nurse,burp,curse,fur,hurt,purse,surf,turf
or:sport,bore,core,dorm,fort,horse,more,north,port,sort,tore,wore
ir:bird,chirp,dirt,first,girst,mirk,quirk,shirt,thirsty
er:persimon,alert,better,certificate,determine,fertile,Germany,herb,jerk,merchant,nervous,perk,serpent,term,verge,wherever