Null (-null) additive

null-null additive

distributions of tree-tree distances

tree-tree

null brush Null

null character Null

null pointer Null

null reference Null

null statement Null

null string Null

null terminator Null

null-terminated character string Null

ancient tree and famous tree

Compressed Frequent Pattern Tree CFP-Tree

data cube aggregate-tree cube DCA-tree cube

Distribution of tree-to-tree distance

Double B~+-tree(DB~+-tree)

Even-odd Markov chain fields indexed by Bethe tree (Cayley tree)

frequent pattern tree (FP-tree)