Based on the information provided and the typical structure of a plot diagram, the two correct responses that would likely fit in the middle of the plot diagram are:
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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 the climax and a key turning point in the story where Gortsby confronts the young man's story and discovers the cake of soap, leading to the resolution of the plot.