You put "the" before any property to use the property's value, just as you would with a function. For example, "Put the userLevel into field 3".
See Properties.
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You generally precede functions with the word "the", unless you include parameters after the function name. Functions that use "of" or that follow "get" don't need "the" preceding them. For example, "number of cards" returns the number of cards in the current stack.