Based on the details provided and typical plot structure, the two correct answers to include in the middle of the plot diagram would be:
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After listening to his story, Gortsby accuses the young man of lying because he cannot produce the cake of soap that forms part of his story.
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After the young man leaves, Gortsby finds a cake of soap lying on the bench and believes that the young man left it there.
These details represent pivotal moments in the story's development, contributing to the climax and resolution as they lead to Gortsby's realization and eventual decision-making.