59 mins ago, by
SteamyRoot If $1 = (0,0), 2 = (1,0), 3 = (0,1), 4 = (1,1)$, then you map, say, $2$ to $(1 2)(3 4)$ because $2 \cdot 1 = (0,0) + (1,0) = (2,0) = 2$, $2 \cdot 2 = (1,0) + (1,0) = (0,0) = 1$, $2 \cdot 3 = (1,0) + (0,1) = (1,1) = 4$, $2 \cdot 4 = (1,0) + (1,1) = (0,1) = 3$