为什么使用领带的 Netlogo 链接不起作用？

Question

以下代码创建 2 辆汽车，然后在它们后面添加手推车（称为“跟随者”）。该代码旨在将追随者均匀地分布在汽车后面，一个接一个，然后将它们连接在一起。然后，当汽车移动时，他们应该拉动追随者。但只有第一个关系（汽车和最近的追随者）似乎在工作。

globals [small  len_small ]
breed [cars car]
breed [followers follower]

cars-own [reg no_foll  len]
followers-own [reg]

to setup
  clear-all
   set small 2
   set len_small 7
 
  ask patches with [pycor >= 5 or pycor <=  1][set pcolor red]
  ask patches with [pycor = 4 ][set pcolor blue]
   ask patches with [ pycor = 2][set pcolor blue + 1]
  ask patches with [pycor = 3][set pcolor white]
  make_small
  reset-ticks

end

to go
  ask cars [forward 2]
  
end

to make_small
 create-cars  small  [move-to one-of patches with [pcolor = white  ]
    set shape "circle" set color red  set reg who set no_foll 0  set len len_small
    set heading one-of  [90 270]]
  
   create-followers (len_small - 1) * small [ set shape "car" set color red move-to one-of cars with [color = red and no_foll < (len_small - 1)]
    set heading [heading] of one-of cars-here + 180 set reg [reg] of one-of cars-here ask one-of cars-here [set no_foll no_foll + 1]]
  form_small_car
end

to form_small_car
  ask followers with [color = red ] [while [any? other turtles-here with [reg = [reg] of myself]][forward 1]]
  ask cars with [color = red] [let foll_behind_list followers-on patch-ahead -1 let foll_behind one-of foll_behind_list with [reg = [reg] of myself] create-link-to foll_behind [tie]]
  ask followers with [color = red and any? followers-on patch-ahead -1] [let foll_behind_list followers-on patch-ahead -1 let foll_behind one-of foll_behind_list with [reg = [reg] of myself ] 
  create-link-to foll_behind [tie]]
 end

我哪里错了？ [顺便说一句，在这个示例代码中，追随者的选择是过度的，但在更大的模型中需要到位，以便只有追随者连接到同一辆车链接]

谢谢，

凯文