In a play, which element related to theme is introduced in act 1, built up in act 2, and resolved in act 3?

The central conflict is introduced early, developed through the middle of the play, and resolved near the end. In this structure, act 1 presents the main problem, act 2 builds tension around it, and act 3 brings it to a conclusion. The setting and main characters are generally introduced rather than resolved.

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