def delete_subscript(class_, script, subscript):
        """
        Returns a script with the given subscript removed. The subscript
        must appear in the main script aligned to opcode boundaries for it
        to be removed.
        """
        new_script = bytearray()
        pc = 0
        for opcode, data, pc, new_pc in class_.ScriptTools.get_opcodes(script):
            section = script[pc:new_pc]
            if section != subscript:
                new_script.extend(section)
        return bytes(new_script)
Returns a script with the given subscript removed. The subscript
        must appear in the main script aligned to opcode boundaries for it
        to be removed.