Be in doubt, to be uncertain, Figure something out, To solve or understand something, Find a solution, To get the answer to a problem, have sound reasoning, To explain well in order to make a decision, not have a clue, to not understand or not to have any information about, make a connection, to realize two concepts are related in some way, reach a conclusion, to make a decision or form an opinion about something as a result of reasoning, think (something) through, to consider the results of a tentative action, work (something) out, to come to a conclusion or solve.

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