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Participants underwent different kinds of training on the permission type of Wason's Four-Card problem to determine whether transfer of general solution principles would occur to the arbitrary type of Wason's Four-Card problem. There were four training conditions: (a) practice, (b) practice with feedback, (c) problem comparison only, and (d) problem comparison with feedback. Those participants who performed problem comparison on permission problems during practice solved more arbitrary problems during testing than did those participants who did not perform problem comparison. These findings suggest that through problem comparison participants learned how to apply general rules of logic from practice.