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FunctionField with more than 1 variable

I have tried the following to construct an appropriate function field:

F.<a,b>=FunctionField(QQ,2)


as a result I got

TypeError: create_key() got multiple values for keyword argument 'names'


after that I looked for the documentation but only find one variable examples. I also tried a few more versions like

F.<a,b>=FunctionField(QQ,names=('a','b'))


but did not work. Thank for any advice in this direction in advance.