PETROSUM

em er es et me mo mu oe om op or os pe re so to um up us ut

ems emu ers met mop mor mos mot mus mut oes oms ope ops opt ore ors ort ose our out per pes pet pom pot pro pst pur pus put rem rep res ret roe rom rot rue rum rut ser set som sop sot sou sue sum sup toe tom top tor tup ump upo ups urp use ute uts

emus epos eros erst euro meou mope mops more mors mort most mote mots moue mure muse must mute muts omer opes opts opus ores orts ours oust outs perm pert peso pest pets poem poet pome poms pore port pose post pots pour pout prom pros pure purs puts rems repo reps rest rets roes romp roms rope rose rote rots roue roup rout rues rump rums ruse rust ruts sept smut some sore sort soup sour spot spue spur stem step stop stum suer suet sumo sump supe sure temp term toes tome toms tope tops tore tors tour tres trop true tump tups umps urps user utes