Dr. Curious is doing a follow-up study to the mutilated checkerboard problem experiment. In this new study, participants solve the following shoe problem before tackling the checkerboard problem. By doing this, Dr. Curious is studying the effect of _____ on problem solving. The shoe problem: A first-grade class is using a trampoline in gym class, so all the children have removed their shoes, which are all jumbled in a large pile. One of the students, Miguel, is leaving early, so the teacher tells him to grab his shoes and report to the lobby. In his hurry, Miguel grabs two identical left-footed, size 6 red sneakers and runs to his mother still sock-footed. Will the remaining students be able to shoe-up with the remaining shoes without getting a foot-ache?