>>> symbolic n;
>>> 
>>> I1 := {[i,j] : 1 <= i < j <= n};
>>> I2 := {[i,j,k] : 1 <= i < j,k <= n};
>>> I3 := {[i] : 1 <= i <= n};
>>> I4 := {[i,j] : 1 <= j < i <= n};
>>> I5 := {[i] : 1 <= i <= n};
>>> 
>>> T1 := {[i,j] -> [i-1,0,n-i,n-j]};
>>> T2 := {[i,j,k] -> [i-1,1,n-i,n-j]};
>>> T3 := {[i] -> [0,0,0,i]};
>>> T4 := {[i,j] -> [j+n-1,0,i,j]};
>>> T5 := {[i] -> [i+n-2,1,0,0]};
>>> 
>>> T1(I1);
{[In_1,0,n-In_1-1,In_4]: 0 <= In_1 && 2+In_1+In_4 <= n && 0 <= In_4}
>>> T2(I2);
{[In_1,1,n-In_1-1,In_4]: 0 <= In_1 && 2+In_1+In_4 <= n && 0 <= In_4}
>>> T3(I3);
{[0,0,0,i]: 1 <= i <= n}
>>> T4(I4);
{[In_1,0,i,In_1-n+1]: i <= n <= In_1 && 2+In_1 <= n+i}
>>> T5(I5);
{[In_1,1,0,0]: n-1 <= In_1 <= 2n-2}
>>> codegen T1:I1,T2:I2;
for(t1 = 0; t1 <= n-2; t1++) {
  for(t4 = 0; t4 <= -t1+n-2; t4++) {
    s1(t1+1,n-t4);
  }
  for(t4 = 0; t4 <= -t1+n-2; t4++) {
    s2(t1+1,n-t4,N/A);
  }
}

>>> codegen T1:I1,T2:I2,T3:I3,T4:I4,T5:I5;
for(t1 = 0; t1 <= 2*n-2; t1++) {
  if (t1 <= 0) {
    for(t4 = 1; t4 <= n; t4++) {
      s3(t4);
    }
  }
  for(t4 = 0; t4 <= -t1+n-2; t4++) {
    s1(t1+1,n-t4);
  }
  if (t1 >= n) {
    for(t3 = -n+t1+2; t3 <= n; t3++) {
      s4(t3,t1-n+1);
    }
  }
  for(t4 = 0; t4 <= -t1+n-2; t4++) {
    s2(t1+1,n-t4,N/A);
  }
  if (t1 >= n-1) {
    s5(-n+t1+2);
  }
}

>>> codegen 2 T1:I1,T2:I2,T3:I3,T4:I4,T5:I5;
for(t4 = 1; t4 <= n; t4++) {
  s3(t4);
}
for(t4 = 0; t4 <= n-2; t4++) {
  s1(1,-t4+n);
}
for(t4 = 0; t4 <= n-2; t4++) {
  s2(1,-t4+n,N/A);
}
if (n == 1) {
  s5(-n+2);
}
for(t1 = 1; t1 <= n-2; t1++) {
  for(t4 = 0; t4 <= -t1+n-2; t4++) {
    s1(t1+1,n-t4);
  }
  for(t4 = 0; t4 <= -t1+n-2; t4++) {
    s2(t1+1,n-t4,N/A);
  }
}
if (n >= 2) {
  s5(1);
}
for(t1 = max(n,1); t1 <= 2*n-2; t1++) {
  for(t3 = t1-n+2; t3 <= n; t3++) {
    s4(t3,t1-n+1);
  }
  s5(-n+t1+2);
}