AB.mind.getAction = function ( x )		// x is an array of [ ai, aj, ei, ej ]
	{ 
		var ai = x[0];
		var aj = x[1];
		var ei = x[2];
		var ej = x[3];

		// if strictly move away, will get stuck at wall, so introduce randomness 

		 if ( ej < aj ) 	return ( AB.randomPick ( ACTION_UP,		AB.randomPick(ACTION_RIGHT,ACTION_LEFT) 	)); 
		 if ( ej > aj ) 	return ( AB.randomPick ( ACTION_DOWN,	AB.randomPick(ACTION_RIGHT,ACTION_LEFT) 	)); 

		 if ( ei < ai ) 	return ( AB.randomPick ( ACTION_RIGHT,	AB.randomPick(ACTION_UP,ACTION_DOWN) 		)); 
		 if ( ei > ai ) 	return ( AB.randomPick ( ACTION_LEFT,	AB.randomPick(ACTION_UP,ACTION_DOWN) 		)); 

 		return  ( AB.randomIntAtoB (0,3) );
	};