Bored of Nim

Rahul and Rashi are bored of playing the game of Nim all day. More so, Rahul has been losing all the games. Actually, the array of stone piles for a game is always selected by Rashi from a huge N-length array A. This selected array is always a subarray of A. Rahul, now frustrated by his losing streak, insists that he would play the next game only if she chooses a game array of length m. Can you