My advise to Anna on what she should do now is: Anna should forget about buying the car as she does not have a valid contract to buy the car from Philip.
Contract is an agreement enter between two people or two or more people in which the parties involve in the agreement agreed to the terms and condition of the contract.
Based on the given scenario Anna does not have a valid contract with Philip based on the fact that has changed his mind and decided to keep the car.
Therefore my advise to Anna on what she should do now is that Anna should forget about buying the car as she does not have a valid contract to buy the car from Philip.
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