human
Solve the following python programming problem given the following code:
@ staticmethod 
def _freeMemberAccessChainsWithPositions(pyAst) : 
    def is_pureMapping_call(node) : 
        return (isinstance (node, ast.Call) and isinstance (node.func, ast.Name) and (node.func.id == 'pureMapping')) 
freeVariableMemberAccessChains = PyAstFreeVariableAnalyses.getFreeVariableMemberAccessChains (pyAst, isClassContext = False, getPositions = True, exclude_predicate = is_pureMapping_call) 
    return <MASK> 
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
freeVariableMemberAccessChains