No comment. Sorry.

	adding
	add: add:ifPresent:

	element comparison
	is:equalTo:

	enumerating
	do:

	initialization
	initialize:

	node enumeration
	nodesDo:

	private
	atForward:put: forward: is:before: is:theNodeFor: next randomLevel search:updating:

	removing
	remove: remove:ifAbsent: removeAll

	testing
	includes: isEmpty

	accessing	top
	level
	maxLevel
	maxLevel:
	size Answer how many elements the receiver contains.
	sortBlock
	sortBlock:

	adding	top
	add: Include newObject as one of the receiver's elements. Answer newObject. ArrayedCollections cannot respond to this message.
	add:ifPresent:

	element comparison	top
	is:equalTo:

	enumerating	top
	do: Evaluate aBlock with each of the receiver's elements as the argument.

	initialization	top
	initialize:

	node enumeration	top
	nodesDo:

	private	top
	atForward:put:
	forward:
	is:before:
	is:theNodeFor:
	next
	randomLevel
	search:updating:

	removing	top
	remove: Remove oldObject from the receiver's elements. Answer oldObject unless no element is equal to oldObject, in which case, raise an error. ArrayedCollections cannot respond to this message.
	remove:ifAbsent: Remove oldObject from the receiver's elements. If several of the elements are equal to oldObject, only one is removed. If no element is equal to oldObject, answer the result of evaluating anExceptionBlock. Otherwise, answer the argument, oldObject. ArrayedCollections cannot respond to this message.
	removeAll

	testing	top
	includes: Answer whether anObject is one of the receiver's elements.
	isEmpty Answer whether the receiver contains any elements.

	instance creation	top
	maxLevel: SkipList maxLevel: 5
	maxLevel:sortBlock:
	new SkipList new
	new: Answer an instance of this class with the number of indexable variables specified by the argument, sizeRequested.
	new:sortBlock:
	newFrom: Create an object that has similar contents to aSimilarObject. If the classes have any instance varaibles with the same names, copy them across. If this is bad for a class, override this method.
	sortBlock: