add missing javadoc asterisks
Update Creative Commons license URL in legal notices
consistent ternary operator style
s/nonnull/non-null/
coding style
untabify
whitespace
;; => ;
Replace unicode in comment
Improved Navigable interface, and associated ConcurrentSkipList* implementations
Improve pollLast* implementation; other minor touchups
Javadoc improvements
Add Navigable interfaces for concurrent skip list classes; adjust accordingly
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