we have {studied|analyzed|researched} {selection|assortment|set} {slot machines |slots |one-armed bandits} in {online|online} casinos, {to |in order} {to choose |understand |estimate} {the best|optimal} sites {virtual|Internet| online} {slots| slot machines} for {visitors| gamblers|players|users|clients|#file_links<>C:\Users\Admin\Desktop\file\gsa+en+Phoenix30k60k120k240k1035URLBB.txt",1,N] in {USA|United States|America}.