Rather than <number>yy, you could do y<number>j or y<number>k and it works appropriately with the relative numbers; yj == 2yy. I always use this with c, d, and

Rather than <number>yy, you could do y<number>j or y<number>k and it works appropriately with the relative numbers; yj == 2yy. I always use this with c, d, and y commands.