[ 1 ] { size: 1,2; }
[ 2 ] { offset: 2,0; origin: 1; }
[ 3 ] { offset: 1,0; origin: 2; }
[ 4 ] { offset: 1,0; origin: 3; }
[ 5 ] { offset: 0,-1; origin: 1; }

[ 4 ] --> [ 1 ]