The repeated lines contribute to the overall meaning of the poem in the following ways:
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The back and forth matches the ferry ride. - The repetition of the phrase emphasizes the cyclical nature of the experience, mirroring the literal journey of going back and forth on the ferry. This reinforces the theme of movement and transition in the poem.
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They emphasize the ride on the ferry. - By repeating these lines, the poet underscores the significance of the ferry ride as a central element of the experience shared by the characters, highlighting its impact on their feelings of tiredness and merriment.