user: What would the C source look like for the assembly code provided here:

```asm
<Stirling2>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0xa8,%rsp
  mov    %edi,0x68(%rsp)
  cmp    %esi,%edi
  jl     L609
  test   %esi,%esi
  jle    L609
  cmp    $0x1,%esi
  je     L285
  cmp    %esi,%edi
  je     L285
  xor    %r11d,%r11d
  mov    %r11d,0x10(%rsp)
  mov    %esi,%r11d
L690:
  mov    0x68(%rsp),%eax
  mov    %r11d,0x88(%rsp)
  mov    %eax,0x54(%rsp)
  sub    $0x1,%eax
  mov    %eax,0x68(%rsp)
  cmp    %r11d,%eax
  jl     L208
  test   %r11d,%r11d
  jle    L208
  cmp    %r11d,%eax
  je     L603
  mov    %eax,0x40(%rsp)
  movl   $0x0,0x4(%rsp)
  cmp    $0x1,%r11d
  je     L603
  mov    %r11d,0x6c(%rsp)
L451:
  mov    0x40(%rsp),%eax
  mov    %r11d,0x8c(%rsp)
  mov    %eax,0x64(%rsp)
  sub    $0x1,%eax
  mov    %eax,0x40(%rsp)
  cmp    %r11d,%eax
  jl     L304
  test   %r11d,%r11d
  jle    L304
  cmp    %r11d,%eax
  je     L8
  mov    %eax,0x44(%rsp)
  movl   $0x0,0x8(%rsp)
  cmp    $0x1,%r11d
  je     L8
  mov    %r11d,0x70(%rsp)
L53:
  mov    0x44(%rsp),%eax
  mov    %r11d,0x90(%rsp)
  mov    %eax,0x58(%rsp)
  sub    $0x1,%eax
  mov    %eax,0x44(%rsp)
  cmp    %r11d,%eax
  jl     L736
  test   %r11d,%r11d
  jle    L736
  cmp    %r11d,%eax
  je     L207
  mov    %eax,0x48(%rsp)
  movl   $0x0,0xc(%rsp)
  cmp    $0x1,%r11d
  je     L207
  mov    %r11d,0x74(%rsp)
L168:
  mov    0x48(%rsp),%eax
  mov    %r11d,0x94(%rsp)
  mov    %eax,0x60(%rsp)
  sub    $0x1,%eax
  mov    %eax,0x48(%rsp)
  cmp    %r11d,%eax
  jl     L672
  test   %r11d,%r11d
  jle    L672
  cmp    %r11d,%eax
  je     L402
  mov    %eax,0x14(%rsp)
  xor    %r10d,%r10d
  cmp    $0x1,%r11d
  je     L402
  mov    %r11d,0x78(%rsp)
  mov    %r11d,%r15d
  mov    %r10d,%r14d
L227:
  lea    -0x1(%rax),%r11d
  mov    %r15d,0x98(%rsp)
  mov    %r11d,0x84(%rsp)
  cmp    %r15d,%r11d
  jl     L557
  test   %r15d,%r15d
  jle    L557
  cmp    %r15d,%r11d
  je     L248
  mov    %r15d,%r9d
  xor    %r10d,%r10d
  cmp    $0x1,%r15d
  je     L248
  mov    %r14d,0x80(%rsp)
  mov    %r10d,%r13d
  mov    %r9d,%r12d
  mov    %r15d,0x7c(%rsp)
  mov    %r11d,%r15d
L732:
  mov    %r15d,0x18(%rsp)
  sub    $0x1,%r15d
  mov    %r12d,0x4c(%rsp)
  cmp    %r12d,%r15d
  jl     L828
  test   %r12d,%r12d
  jle    L828
  cmp    $0x1,%r12d
  je     L199
  mov    %r12d,%ebx
  xor    %r14d,%r14d
  cmp    %r12d,%r15d
  je     L199
  mov    %r14d,%edx
  mov    %r12d,%r10d
  mov    %r13d,%r14d
  mov    %r15d,%r13d
L184:
  mov    %r15d,%r8d
  mov    %ebx,0x1c(%rsp)
  sub    $0x1,%r15d
  test   %ebx,%ebx
  jle    L812
  cmp    %ebx,%r15d
  jl     L812
  cmp    $0x1,%ebx
  je     L360
  mov    %ebx,%r12d
  xor    %r11d,%r11d
  cmp    %ebx,%r15d
  je     L360
  mov    %r11d,%ebp
  mov    %r14d,%r9d
  mov    %ebx,%r11d
  mov    %r15d,%r14d
  mov    %r15d,%ebx
  mov    %r13d,%r15d
L797:
  mov    %ebx,0x5c(%rsp)
  sub    $0x1,%ebx
  mov    %r12d,0x9c(%rsp)
  test   %r12d,%r12d
  jle    L450
  cmp    %r12d,%ebx
  jl     L450
  cmp    $0x1,%r12d
  je     L245
  mov    %ebx,%edi
  mov    %r12d,%esi
  xor    %ecx,%ecx
  cmp    %r12d,%ebx
  je     L245
  mov    %ebp,0x20(%rsp)
  mov    %ebx,%ebp
  mov    %ecx,%ebx
  mov    %r12d,0x24(%rsp)
  mov    %r9d,%r12d
L745:
  mov    %edi,%r13d
  sub    $0x1,%edi
  mov    %r11d,0x3c(%rsp)
  mov    %r10d,0x38(%rsp)
  mov    %r8d,0x34(%rsp)
  mov    %edx,0x30(%rsp)
  mov    %esi,0x50(%rsp)
  mov    %esi,0x2c(%rsp)
  mov    %edi,0x28(%rsp)
  call   <Stirling2>
  mov    0x2c(%rsp),%esi
  mov    0x28(%rsp),%edi
  mov    0x30(%rsp),%edx
  mov    0x34(%rsp),%r8d
  imul   %esi,%eax
  mov    0x38(%rsp),%r10d
  mov    0x3c(%rsp),%r11d
  add    %eax,%ebx
  cmp    %r13d,%esi
  jg     L618
  sub    $0x1,%esi
  cmp    $0x1,%esi
  je     L356
  cmp    %r13d,0x50(%rsp)
  jne    L745
L356:
  mov    %ebx,%ecx
  mov    %r12d,%r9d
  mov    0x24(%rsp),%r12d
  mov    %ebp,%ebx
  lea    0x1(%rcx),%eax
  mov    0x20(%rsp),%ebp
  imul   %r12d,%eax
  add    %eax,%ebp
L450:
  cmp    0x5c(%rsp),%r12d
  jg     L781
  sub    $0x1,%r12d
  cmp    $0x1,%r12d
  je     L481
  mov    0x5c(%rsp),%edi
  cmp    %edi,0x9c(%rsp)
  jne    L797
L481:
  lea    0x1(%rbp),%eax
  mov    %r15d,%r13d
  mov    %r11d,%ebx
  mov    %r14d,%r15d
  imul   %r11d,%eax
  mov    %r9d,%r14d
  add    %eax,%edx
L812:
  cmp    %r8d,%ebx
  jg     L305
L242:
  sub    $0x1,%ebx
  cmp    $0x1,%ebx
  je     L125
  cmp    %r8d,0x1c(%rsp)
  jne    L184
L125:
  lea    0x1(%rdx),%eax
  mov    %r13d,%r15d
  mov    %r14d,%r13d
  mov    %r10d,%r12d
  imul   %r10d,%eax
  add    %eax,%r13d
L828:
  cmp    0x18(%rsp),%r12d
  jg     L577
L760:
  sub    $0x1,%r12d
  cmp    $0x1,%r12d
  je     L798
  mov    0x18(%rsp),%esi
  cmp    %esi,0x4c(%rsp)
  jne    L732
L798:
  mov    0x7c(%rsp),%r15d
  lea    0x1(%r13),%eax
  mov    0x80(%rsp),%r14d
  imul   %r15d,%eax
  add    %eax,%r14d
L557:
  cmp    0x14(%rsp),%r15d
  jg     L137
L479:
  sub    $0x1,%r15d
  cmp    $0x1,%r15d
  je     L353
  mov    0x14(%rsp),%ecx
  cmp    %ecx,0x98(%rsp)
  je     L353
  mov    0x84(%rsp),%eax
  mov    %eax,0x14(%rsp)
  jmp    L227
  nop
L781:
  mov    %r11d,%ebx
  mov    %ebp,%r11d
  mov    %r15d,%r13d
  mov    %r14d,%r15d
  imul   %ebx,%r11d
  mov    %r9d,%r14d
  add    %r11d,%edx
  cmp    %r8d,%ebx
  jle    L242
L305:
  mov    %edx,%eax
  mov    %r13d,%r15d
  mov    %r14d,%r13d
  mov    %r10d,%r12d
  imul   %r10d,%eax
  add    %eax,%r13d
  cmp    0x18(%rsp),%r12d
  jle    L760
L577:
  mov    0x7c(%rsp),%r15d
  mov    %r13d,%eax
  mov    0x80(%rsp),%r14d
  imul   %r15d,%eax
  add    %eax,%r14d
  cmp    0x14(%rsp),%r15d
  jle    L479
L137:
  mov    0x78(%rsp),%r11d
  mov    %r14d,%eax
  imul   %r11d,%eax
  add    %eax,0xc(%rsp)
L672:
  cmp    0x60(%rsp),%r11d
  jg     L761
L167:
  sub    $0x1,%r11d
  cmp    $0x1,%r11d
  je     L273
  mov    0x60(%rsp),%edi
  cmp    %edi,0x94(%rsp)
  jne    L168
L273:
  mov    0xc(%rsp),%eax
  mov    0x74(%rsp),%r11d
  add    $0x1,%eax
  imul   %r11d,%eax
  add    %eax,0x8(%rsp)
L736:
  cmp    0x58(%rsp),%r11d
  jg     L212
L455:
  sub    $0x1,%r11d
  cmp    $0x1,%r11d
  je     L294
  mov    0x58(%rsp),%esi
  cmp    %esi,0x90(%rsp)
  jne    L53
L294:
  mov    0x8(%rsp),%eax
  mov    0x70(%rsp),%r11d
  add    $0x1,%eax
  imul   %r11d,%eax
  add    %eax,0x4(%rsp)
L304:
  cmp    0x64(%rsp),%r11d
  jg     L343
L415:
  sub    $0x1,%r11d
  cmp    $0x1,%r11d
  je     L668
  mov    0x64(%rsp),%ecx
  cmp    %ecx,0x8c(%rsp)
  jne    L451
L668:
  mov    0x4(%rsp),%eax
  mov    0x6c(%rsp),%r11d
  add    $0x1,%eax
  imul   %r11d,%eax
  add    %eax,0x10(%rsp)
L208:
  cmp    0x54(%rsp),%r11d
  jg     L324
L782:
  sub    $0x1,%r11d
  cmp    $0x1,%r11d
  je     L517
  mov    0x54(%rsp),%ecx
  cmp    %ecx,0x88(%rsp)
  jne    L690
L517:
  mov    0x10(%rsp),%r11d
  add    $0x1,%r11d
L763:
  add    $0xa8,%rsp
  mov    %r11d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L360:
  add    %ebx,%edx
  jmp    L812
L199:
  add    %r12d,%r13d
  jmp    L828
  nop
L618:
  mov    %ebx,%ecx
  mov    %r12d,%r9d
  mov    0x24(%rsp),%r12d
  mov    %ebp,%ebx
  mov    %ecx,%eax
  mov    0x20(%rsp),%ebp
  imul   %r12d,%eax
  add    %eax,%ebp
  jmp    L450
L353:
  mov    0x78(%rsp),%r11d
  lea    0x1(%r14),%eax
  imul   %r11d,%eax
  add    %eax,0xc(%rsp)
  cmp    0x60(%rsp),%r11d
  jle    L167
L761:
  mov    0x74(%rsp),%r11d
  mov    0xc(%rsp),%eax
  imul   %r11d,%eax
  add    %eax,0x8(%rsp)
  cmp    0x58(%rsp),%r11d
  jle    L455
L212:
  mov    0x70(%rsp),%r11d
  mov    0x8(%rsp),%eax
  imul   %r11d,%eax
  add    %eax,0x4(%rsp)
  cmp    0x64(%rsp),%r11d
  jle    L415
L343:
  mov    0x6c(%rsp),%r11d
  mov    0x4(%rsp),%eax
  imul   %r11d,%eax
  add    %eax,0x10(%rsp)
  cmp    0x54(%rsp),%r11d
  jle    L782
L324:
  mov    0x10(%rsp),%r11d
  jmp    L763
  nopw   0x0(%rax,%rax,1)
L248:
  add    %r15d,%r14d
  jmp    L557
  nopl   0x0(%rax,%rax,1)
L245:
  add    %r12d,%ebp
  jmp    L450
L402:
  add    %r11d,0xc(%rsp)
  jmp    L672
L8:
  add    %r11d,0x4(%rsp)
  jmp    L304
L207:
  add    %r11d,0x8(%rsp)
  jmp    L736
L603:
  add    %r11d,0x10(%rsp)
  jmp    L208
L609:
  xor    %r11d,%r11d
  jmp    L763
L285:
  mov    $0x1,%r11d
  jmp    L763
```

assistant: ```c
int Stirling2(int n, int k) {
  if (k < 1 || k > n)
    return 0;
  if (k == 1 || k == n)
    return 1;
  return k * Stirling2(n - 1, k) + Stirling2(n - 1, k - 1);
}
```