function randomPick ( a, b )
{
 if ( randomBoolean() ) 
  return a;
 else
  return b;
}

function Mind() { 
//--- public functions / interface / API ----------------------------------------------------------

	this.newRun = function()
	{
	};

	this.endRun = function()
	{
	};

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

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

 		return  ( randomintAtoB (0,3) );
	};



}