Syntax:  {x target}{y target}
x names: l is left, c is center, r is right
y names: t is top,  m is middle, b is bottom

Example: rm => character walking towards the right middle

Illustration:
  lt----ct---rt
  | \   |   / |
  |   \ | /   |
  lm----X----rm
  |   / | \   |
  | /   |   \ |
  lb---cb----rb
