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Callouts using co:

   |(let ①loopvar ②((count 1))
   |  ③(if (> count 10)
   |    ④#t
   |    (⑤loopvar ⑥(+ count 1))))
   | 
   |(let ⑦loopvar ⑧((count 1))
   |  ⑨(if (> count 10)
   |    ⑩#t
   |    (⑪loopvar ⑫(+ count 1))))
   | 
   |(let ⑬loopvar ⑭((count 1))
   |  ⑮(if (> count 10)
   |    ⑯#t
   |    (⑰loopvar ⑱(+ count 1))))
   | 
   |(let ⑲loopvar ⑳((count 1))
   |  ⑴(if (> count 10)
   |    ⑵#t
   |    (⑶loopvar ⑷(+ count 1))))

①: This variable controls the loop. It is declared without an initial value, immediately after the let operand.
②: Any number of additional local variables can be defined after the loop variable, just as they can in any other let expression.
③: If you ever want the loop to end, you have to put some sort of a test in it.
④: This is the value that will be returned.
⑤: Note that you iterate the loop by using the loop variable as if it was a function name.
⑥: The arguments to this function are the values that you want the local variables declared in ② to have in the next iteration.
⑦: This variable controls the loop. It is declared without an initial value, immediately after the let operand.
⑧: Any number of additional local variables can be defined after the loop variable, just as they can in any other let expression.
⑨: If you ever want the loop to end, you have to put some sort of a test in it.
⑩: This is the value that will be returned.
⑪: Note that you iterate the loop by using the loop variable as if it was a function name.
⑫: The arguments to this function are the values that you want the local variables declared in ② to have in the next iteration.
⑬: This variable controls the loop. It is declared without an initial value, immediately after the let operand.
⑭: Any number of additional local variables can be defined after the loop variable, just as they can in any other let expression.
⑮: If you ever want the loop to end, you have to put some sort of a test in it.
⑯: This is the value that will be returned.
⑰: Note that you iterate the loop by using the loop variable as if it was a function name.
⑱: The arguments to this function are the values that you want the local variables declared in ② to have in the next iteration.
⑲: This variable controls the loop. It is declared without an initial value, immediately after the let operand.
⑳: Any number of additional local variables can be defined after the loop variable, just as they can in any other let expression.
⑴: If you ever want the loop to end, you have to put some sort of a test in it.
⑵: This is the value that will be returned.
⑶: Note that you iterate the loop by using the loop variable as if it was a function name.
⑷: The arguments to this function are the values that you want the local variables declared in ② to have in the next iteration.