DY ( cX ) IYe ¸ffÂff ½ff»fZ Vf¶QûÔ IYf A·¹ffÀf IYSmÔX- RY + cY + »f = Q + cY + ²f = ¸f + cY + »fe = ³ff + £fX + cY + ³fX = Àf + cY + £ff = Àf + cY + ¨f + ³ffXXX = IY + ¨ff + »f + cY = °f + cY + RYfX + ³f = ¸ff + Àf + cY + ¸f = Àf + c + SX + ªf = 54