( move back and forth )
0 set-turret!
6 random 2 < { 95 75 set-speed! } { 90 90 set-speed! } ifelse

( rear sensor )
4 sensor? { 90 90 set-speed! } if

( far right front sensor )
5 sensor? { 100 -100 set-speed! } if

( far left front sensor )
6 sensor? { -100 100 set-speed! } if

( right front sensor )
2 sensor? { 80 -80 set-speed! } if

( left front sensor )
3 sensor? { -80 80 set-speed! } if

( immediate front sensor in firing range )
0 sensor?
{
  fire-ready?
  { fire! }
  { -50 -50 set-speed! }
  ifelse
}
if

( near far right front sensor )
8 sensor? { 60 -60 set-speed! } if
9 sensor? { -60 60 set-speed! } if

fire-ready? set-led!

( front far sensor )
7 sensor? fire-ready? & { 100 100 set-speed! } if

( collison sensor )
1 sensor? { -100 -100 set-speed!  0 set-turret! } if