>>> symbolic n,lb,ub;
>>> I1 := {[k,i] : 1 <= k < i <= n && lb <= k <= ub};
>>> I2 := {[k,i,j] : 1 <= k <= i,j <= n && lb <= j <= ub};
>>> p := {[k,i] : 1, lb <= k <= ub < n && k < i <= n};
>>> w := {[k,i,j,k,i] : 1 <= k <= i,j <= n && k < lb = j <= ub};
>>> 
>>> T1 := {[k,i] -> [k,i,0,0,0,0,0,0]};
>>> T2 := {[k,i,j] -> [k,i,1,j,0,0,0,0]};
>>> Tp := {[k,i] -> [k,i,0,0,1,0,0,0]};
>>> Tw := {[k,i,j,t1,t2] -> [k,i,1,j,-1,t1,t2,0]};
>>> 
>>> known := {[*,*,*,*,*,*,*,*] : 1 <= lb && ub <= n};
>>> known2 := {[*,*,*,*,*,*,*,*] : 1 <= lb <= ub <= n};
>>> 
>>> codegen 0 T1:I1,T2:I2,Tp:p,Tw:w given known;
if (lb <= ub) {
  for(t1 = 1; t1 <= ub; t1++) {
    for(t2 = t1; t2 <= n; t2++) {
      if (t1 >= lb && t2 >= t1+1) {
        s1(t1,t2);
      }
      if (ub <= n-1 && t2 >= t1+1 && t1 >= lb) {
        s3(t1,t2);
      }
      for(t4 = max(lb,t1); t4 <= ub; t4++) {
        if (t4 >= t1+1 && t4 <= lb) {
          s4(t1,t2,t4,t1,t2);
        }
        s2(t1,t2,t4);
      }
    }
  }
}

>>> codegen 1 T1:I1,T2:I2,Tp:p,Tw:w given known;
if (lb <= ub) {
  for(t1 = 1; t1 <= ub; t1++) {
    for(t2 = t1; t2 <= n; t2++) {
      if (t1 >= lb && t2 >= t1+1) {
        s1(t1,t2);
      }
      if (ub <= n-1 && t2 >= t1+1 && t1 >= lb) {
        s3(t1,t2);
      }
      for(t4 = max(lb,t1); t4 <= ub; t4++) {
        if (t4 >= t1+1 && t4 <= lb) {
          s4(t1,t2,t4,t1,t2);
        }
        s2(t1,t2,t4);
      }
    }
  }
}

>>> # codegen 2 T1:I1,T2:I2,Tp:p,Tw:w given known;
>>> # codegen 1 T1:I1,T2:I2,Tp:p,Tw:w given known2;
>>> # codegen 2 T1:I1,T2:I2,Tp:p,Tw:w given known2;