default value = value;
default flip = flip;

nbr target;

if(flip == '>,0') {
  target: = ea:; 
    
  if(value != 0 && target:value != 0)
    if(target:value < value)
      value = target:value;
}
else if(flip == '>,1') {
  target: = so:;
   
  if(value != 0 && target:value != 0)
    if(target:value < value)
      value = target:value;
}
else if(flip == '>,2') {
  target: = we:;

  if(value != 0 && target:value != 0)
    if(target:value > value)
      value = target:value;
}
else if(flip == '>,3') {
  target: = no:;

  if(value != 0 && target:value != 0)
    if(target:value > value)
      value = target:value;
}
if(flip)
  flip = flip  % 4 + 1;