Tramps move from port to port without following a fixed rout

Tramps move from port to port without following a fixed route.(  )

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(  )is subsequently exchanged for the marine bill of lading.

(  )is subsequently exchanged for the marine bill of lading.

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The(  )is issued by the shipper to the carrier requesting al

The(  )is issued by the shipper to the carrier requesting allocation of shipping

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