Instantiate an internal node.
Instantiate an internal node.
Ordering that also supports linear distance |x-y|
Obtain the node stored at a given key if it exists, None otherwise
Obtain the node stored at a given key if it exists, None otherwise
create a new Black node from a key, value, left subtree and right subtree
create a new Black node from a key, value, left subtree and right subtree
create a new Red node from a key, value, left subtree and right subtree
create a new Red node from a key, value, left subtree and right subtree