operand (child node) from this query node.
@param operand the child to remove.
@return true if the operand was in the list of child nodesand has been removed; false if this node does not contain operand as a child node.
operand (child node) from this query node.
@param operand the child to remove.
@return true if the operand was in the list of child nodesand has been removed; false if this node does not contain operand as a child node.
operand (child node) from this query node.
@param operand the child to remove.
@return true if the operand was in the list of child nodes and has been removed;false if this node does not contain operand as a child node.
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