order='comparison_level',
operator=expression.left.operator,
left=NormalVariableExpression(variable=left_variable),
right=NormalVariableExpression(variable=middle_variable),
),
right=parsing.FurInfixExpression(
order='comparison_level',
operator=expression.left.operator,
left=NormalVariableExpression(variable=left_variable),
right=NormalVariableExpression(variable=middle_variable),
),
right=parsing.FurInfixExpression(