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On page 9 you can read it very well, not 100% clear but the example pictures will do the rest. The picture in the down middle picture shows it.
The contract card taken is then placed on the Player’s board; on an empty contract space or over a previously fulfilled (face-down) contract.
If a contract is placed onto an empty slot, the Player receives the ticket depicted on the slot, taken from the box office.
If the slot contained a previously fulfilled contract, put the card face up on a discard pile next to the contract deck, and place the new contract on the space.
However, the Player does not receive the ticket printed on the space a second time. If there was an Assistant on the flipped order card, it is sent home (Going Home- see p. 6).