Hi When Man 1 says "here" I think he means Susie's room. The clerk would have known that Man 2 visited the building, but would never have thought that it was to visit Susie Suppose Susie lives on the corridor on the left, at the top of the stairs, but Man 2's uncle lives on the corridor to the right. Suppose the clerk knows about the uncle, but not Susie Provided that the clerk sees Man 2 always heading for the right-hand side of the stairs, the clerk will assume it's a visit to the uncle.
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