Meh! This is just an overly complication of the right-left rule, which makes you think about "complex" 2D geometry instead of a couple of simple spatial pointer

Meh! This is just an overly complication of the right-left rule, which makes you think about "complex" 2D geometry instead of a couple of simple spatial pointers in the declaration you are trying to parse.. The easier, more useful version: http://ieng9.ucsd.edu/~cs30x/rt_lt.rule.html http://ieng9.ucsd.edu/~cs30x/rt_lt.rule.html