def unroot(self):
if len(self.children)==<NUM_LIT:2>:<EOL><INDENT>if not self.children[<NUM_LIT:0>].is_leaf():<EOL><INDENT>self.children[<NUM_LIT:0>].delete()<EOL><DEDENT>elif not self.children[<NUM_LIT:1>].is_leaf():<EOL><INDENT>self.children[<NUM_LIT:1>].delete()<EOL><DEDENT>else:<EOL><INDENT>raise TreeError("<STR_LIT>")<EOL><DEDENT><DEDENT>
Unroots current node. This function is expected to be used on
the absolute tree root node, but it can be also be applied to
any other internal node. It will convert a split into a
multifurcation.