MRKWHW7QPSB7BBOLKP5OZTYKAARQGLSQCOEFKGS64JK5BAODT5OQC
bool find_ray( const coord_def& source, const coord_def& target,
bool allow_fallback, ray_def& ray, int cycle_dir,
bool find_shortest, bool ignore_solid )
bool find_ray(const coord_def& source, const coord_def& target,
bool allow_fallback, ray_def& ray, int cycle_dir,
bool find_shortest, bool ignore_solid)