IV V y GRAVITY_NORTHWEST q IV ˹ P
FV @ 0 pIV r
GRAVITY_NORTH A IV 0IV P
FV @ IV fy GRAVITY_NORTHEAST IV ˹ P
FV @ 0 pIV IC GRAVITY_WEST ! IV ˹ P
FV @ 0 `IV GRAVITY_CENTER IV ˹ P
FV @ 0 IV YC GRAVITY_EAST A IV IV P
FV @ IV By +y GRAVITY_SOUTHWEST IV ˹ P
FV @ 0 @IV r
GRAVITY_SOUTH A IV pIV