Calculate size including the current node
size_incl = 1 NEW_LINE if ( root . left != None ) : NEW_LINE INDENT size_incl += LISS ( root . left . left ) + LISS ( root . left . right ) NEW_LINE DEDENT if ( root . right != None ) : NEW_LINE INDENT size_incl += LISS ( root . right . left ) + LISS ( root . right . right ) NEW_LINE DEDENT