user: Demonstrate the C code that generates the assembly output below:

```asm
<preferd>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x78,%rsp
  mov    %edi,%ebx
  mov    %rsi,-0x90(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  mov    $0x1,%r12d
  mov    %r12d,%eax
  mov    %edi,%ecx
  shl    %cl,%eax
  mov    %eax,-0x78(%rbp)
  movl   $0x0,-0x3c(%rbp)
  lea    -0x3c(%rbp),%rsi
  mov    $0x1,%edx
  mov    $0x0,%eax
  call   <mls@plt>
  cltq
  mov    %rax,-0x70(%rbp)
  lea    0x2(%rbx),%ecx
  shr    %ecx
  shl    %cl,%r12d
  lea    -0x1(%r12),%r14d
  not    %r12d
  mov    %r12d,-0x44(%rbp)
  mov    -0x3c(%rbp),%esi
  mov    %esi,%eax
  mov    %rax,-0x58(%rbp)
  imul   %rax,%rax
  add    $0xf,%rax
  mov    %rax,%rdx
  and    $0xfffffffffffffff0,%rdx
  and    $0xfffffffffffff000,%rax
  mov    %rsp,%rcx
  sub    %rax,%rcx
L95:
  cmp    %rcx,%rsp
  je     L226
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L95
L226:
  mov    %rdx,%rax
  and    $0xfff,%eax
  sub    %rax,%rsp
  test   %rax,%rax
  je     L67
  orq    $0x0,-0x8(%rsp,%rax,1)
L67:
  mov    %rsp,-0x50(%rbp)
  lea    0x1(%rsi),%eax
  lea    0xf(,%rax,4),%rax
  shr    $0x4,%rax
  shl    $0x4,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L248:
  cmp    %rdx,%rsp
  je     L337
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L248
L337:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  test   %rdx,%rdx
  je     L223
  orq    $0x0,-0x8(%rsp,%rdx,1)
L223:
  lea    0x3(%rsp),%rax
  mov    %rax,%rdi
  shr    $0x2,%rdi
  mov    %rdi,-0x98(%rbp)
  and    $0xfffffffffffffffc,%rax
  mov    %rax,-0x88(%rbp)
  test   %esi,%esi
  je     L90
  movl   $0x0,-0x74(%rbp)
  mov    -0x58(%rbp),%rax
  add    $0x1,%rax
  mov    %rax,-0x80(%rbp)
  mov    -0x78(%rbp),%eax
  lea    -0x1(%rax),%r15d
  jmp    L205
L127:
  add    $0x1,%ebx
  cmp    %r15d,%ebx
  je     L20
L172:
  mov    %ebx,%ecx
  mov    %r15d,%edx
  mov    (%r12),%rsi
  mov    0x0(%r13),%rdi
  mov    $0x0,%eax
  call   <innerPro@plt>
  cmp    $0xffffffff,%eax
  setne  %cl
  cmp    %eax,%r14d
  setne  %dl
  test   %dl,%cl
  je     L127
  cmp    %eax,-0x44(%rbp)
  je     L127
  mov    $0x0,%edx
  jmp    L154
L20:
  mov    $0x1,%edx
L154:
  mov    -0x48(%rbp),%esi
  mov    %esi,%eax
  mov    -0x50(%rbp),%rdi
  lea    (%rdi,%rax,1),%rcx
  mov    -0x68(%rbp),%rbx
  mov    %dl,(%rcx,%rbx,1)
  imul   -0x58(%rbp),%rax
  add    -0x60(%rbp),%rdi
  mov    %dl,(%rdi,%rax,1)
  add    $0x1,%esi
  mov    %esi,%eax
  mov    %esi,-0x48(%rbp)
  mov    -0x3c(%rbp),%esi
  cmp    %eax,%esi
  jbe    L52
L274:
  mov    $0x1,%edx
  test   %r15d,%r15d
  je     L154
  mov    -0x48(%rbp),%eax
  mov    -0x70(%rbp),%rsi
  lea    (%rsi,%rax,8),%r12
  mov    $0x0,%ebx
  jmp    L172
L52:
  cmp    -0x74(%rbp),%esi
  jbe    L90
L205:
  mov    -0x74(%rbp),%edi
  mov    %edi,%eax
  imul   -0x80(%rbp),%rax
  mov    -0x50(%rbp),%rsi
  movb   $0x0,(%rsi,%rax,1)
  mov    %edi,%eax
  add    $0x1,%edi
  mov    %edi,-0x74(%rbp)
  mov    -0x3c(%rbp),%esi
  cmp    %esi,%edi
  jae    L90
  mov    %eax,%edx
  mov    -0x70(%rbp),%rsi
  lea    (%rsi,%rdx,8),%r13
  mov    %edi,-0x48(%rbp)
  mov    %eax,%eax
  mov    %rax,-0x60(%rbp)
  imul   -0x58(%rbp),%rax
  mov    %rax,-0x68(%rbp)
  jmp    L274
L90:
  mov    -0x98(%rbp),%rax
  movl   $0x0,0x0(,%rax,4)
  mov    $0x0,%ebx
  mov    -0x58(%rbp),%r8
  mov    -0x50(%rbp),%r10
  mov    -0x88(%rbp),%rdi
  jmp    L7
L64:
  cmp    %ebx,%r9d
  je     L327
  mov    %r9d,%ebx
L7:
  mov    %ebx,%eax
  mov    (%rdi,%rax,4),%ecx
  add    $0x1,%ecx
  cmp    %esi,%ecx
  jae    L327
  mov    %ebx,%r9d
  jmp    L234
L327:
  lea    0x1(%rbx),%r14d
  mov    -0x90(%rbp),%rax
  mov    %r14d,(%rax)
  mov    %r14d,%r15d
  lea    0x0(,%r15,8),%rdi
  call   <malloc@plt>
  mov    %rax,%r13
  mov    -0x78(%rbp),%eax
  lea    -0x1(%rax),%r12d
  mov    %r12d,%edi
  imul   %r15,%rdi
  shl    $0x2,%rdi
  call   <malloc@plt>
  mov    %rax,%r9
  test   %r14d,%r14d
  je     L191
  mov    %ebx,%ebx
  mov    -0x78(%rbp),%eax
  lea    -0x2(%rax),%eax
  lea    0x4(,%rax,4),%rdi
  mov    $0x0,%r10d
  mov    $0x0,%r8d
  mov    -0x70(%rbp),%r11
  mov    -0x88(%rbp),%r14
  jmp    L54
L61:
  mov    %rax,%r8
L54:
  mov    %r10d,%eax
  lea    (%r9,%rax,4),%rcx
  mov    %rcx,0x0(%r13,%r8,8)
  test   %r12d,%r12d
  je     L143
  mov    (%r14,%r8,4),%eax
  lea    (%r11,%rax,8),%rsi
  mov    $0x0,%eax
L148:
  mov    (%rsi),%rdx
  mov    (%rdx,%rax,1),%edx
  mov    %edx,(%rcx,%rax,1)
  add    $0x4,%rax
  cmp    %rdi,%rax
  jne    L148
L143:
  lea    0x1(%r8),%rax
  add    %r12d,%r10d
  cmp    %r8,%rbx
  jne    L61
L191:
  mov    -0x70(%rbp),%rbx
  mov    (%rbx),%rdi
  call   <free@plt>
  mov    %rbx,%rdi
  call   <free@plt>
  mov    -0x38(%rbp),%rax
  sub    %fs:0x28,%rax
  jne    L24
  mov    %r13,%rax
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
L8:
  add    $0x1,%r9d
  mov    %r9d,%eax
  mov    %ecx,(%rdi,%rax,4)
L115:
  add    $0x1,%ecx
  cmp    %esi,%ecx
  je     L64
L234:
  mov    %ecx,%eax
  mov    %r9d,%edx
  mov    (%rdi,%rdx,4),%edx
  imul   %r8,%rdx
  add    %r10,%rax
  cmpb   $0x0,(%rax,%rdx,1)
  je     L115
  mov    %r9d,%eax
  sub    $0x1,%eax
  js     L8
  cltq
  mov    %ecx,%r11d
  add    %r10,%r11
L25:
  mov    (%rdi,%rax,4),%edx
  imul   %r8,%rdx
  cmpb   $0x1,(%r11,%rdx,1)
  jne    L115
  sub    $0x1,%rax
  test   %eax,%eax
  jns    L25
  jmp    L8
L24:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
int **preferd(unsigned n, unsigned *pref_size) {
  unsigned N = 1 << n;
  unsigned i, j, k;
  int l;
  unsigned mls_size = 0;
  int **m = mls(n, &mls_size, 1);
  int mini_val1 = -1;
  int mini_val2 = -1 + (1 << ((n + 2) / 2));
  int mini_val3 = -1 - (1 << ((n + 2) / 2));
  char mat[mls_size][mls_size];
  unsigned pair[mls_size + 1], depth = 0, pdepth = 1;
  int **prefm, *prefmp;
  for (i = 0; i < mls_size; i++) {
    mat[i][i] = 0;
    for (j = i + 1; j < mls_size; j++) {
      char flag = 1;
      for (k = 0; k < N - 1; k++) {
        int inn = innerPro(m[i], m[j], N - 1, k);
        if (inn != mini_val1 && inn != mini_val2 && inn != mini_val3) {
          flag = 0;
          break;
        }
      }
      mat[i][j] = flag;
      mat[j][i] = flag;
    }
  }
  pair[depth] = 0;
  while (pdepth != depth) {
    pdepth = depth;
    for (i = pair[depth] + 1; i < mls_size; i++) {
      if (mat[pair[depth]][i]) {
        int flag = 1;
        for (l = depth - 1; l >= 0; l--)
          if (mat[pair[l]][i] != 1) {
            flag = 0;
            break;
          }
        if (flag)
          pair[++depth] = i;
      }
    }
  }
  *pref_size = depth + 1;
  prefm = malloc(sizeof(int *) * (*pref_size));
  prefmp = malloc(sizeof(int) * (*pref_size) * (N - 1));
  for (i = 0; i < depth + 1; i++) {
    prefm[i] = prefmp + i * (N - 1);
    for (j = 0; j < N - 1; j++)
      prefm[i][j] = m[pair[i]][j];
  }
  free(*m);
  free(m);
  return prefm;
}
```