[INSTRUCTIONS]

You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet. 

## 1. Control Dependence Definition
  Control dependence captures the influence of control-flow decisions on the execution of statements.

  A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.


  **Direct Control Dependence**:
  A statement `S2` is **directly** control-dependent on a statement `S1` if:
  
  1.	`S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
  
  2.	`S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches, 

  - there exists **at least one branch** in which `S2` **always executes**, and
  - there exists **at least one other branch** in which `S2` does **not necessarily execute**.

    “Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.

  `S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.



## 2. Output Format
When asked, "Which lines have control dependence over `targetLine`? List all such lines." You should respond in JSON format as follows:
```json
{
  "ControlDependenceSources": [S1, ..., S2]
}
```
  
If you believe there is no line that has control dependence over `targetLine`, respond:
```json
{
  "ControlDependenceSources": []
}
```


    

## 3. Interprocedural Control Dependence
  All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.


## 4. Example Code Snippet

### Example 1

```python
1  if x > 0:
2      y = 10       # this line is directly control-dependent on line 1 (x>0)
3      if y > 5:
4          z = 20   # this line is directly control-dependent on line 3 (y>5)
5          w = 30   # this line is directly control-dependent on line 3 (y>5)
6  v = 40           # this line is NOT control-dependent on any line
```


**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1. 
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.



#### Example Question 1.1: 
Which lines have control dependence over line `5`? List all such lines.


**Output**: 
```json
{
  "ControlDependenceSources": [1, 3]
}
```

#### Example Question 1.2:
Which lines have control dependence over line `6`? List all such lines.

**Output**: 
```json
{
  "ControlDependenceSources": []
}
```


### Example 2

```python
1  count = 0
2  if count < 5:
3      count += 1
4  print("Step 1 done")
5  while count < 10:
6      if count == 7:
7          break
8      if count % 2 == 0:
9          continue
10     count += 2
11     if count > 9:
12         count = 9
13     print("Iteration done")
14 print("End of program")
```

#### Example Question 2.1: 
Which lines have control dependence over line `13`? List all such lines.

**Analysis**:
  - Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
  - Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
  - Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.


**Output**:
```json
{
  "ControlDependenceSources": [5, 6, 8]
}
```

#### Example Question 2.2: 
Which lines have control dependence over line `10`? List all such lines.


**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. 



**Output**:
```json
{
  "ControlDependenceSources": [5, 6, 8]
}
```


#### Example Question 2.3: 
Which lines have control dependence over line `14`? List all such lines.

**Analysis**: Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition. 

**Output**:
```json
{
  "ControlDependenceSources": []
}
```


#### Example Question 2.4: 
Which lines have control dependence over line `12`? List all such lines.

**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2. 

**Output**:
```json
{
  "ControlDependenceSources": [5, 6, 8, 11]
}
```

---

[YOUR TURN]

Below is **your target snippet**. 

```Python
1   import sys
2   from datetime import datetime
3   from random import randint
4   from itertools import cycle
5   def debug(x):
6       sys.stderr.write('{} DEBUG: {}\n'.format(datetime.now().time(), x))
7   def read_int():
8       return int(raw_input())
9   def read_float():
10      return float(raw_input())
11  def read_words():
12      return raw_input().split()
13  def read_ints():
14      return map(int, read_words())
15  def read_floats():
16      return map(float, read_words())
17  ALLVALS = set(range(1, 100))
18  OT = {19: 20, 20:19}
19  def solve_test_case():
20      curd = 0
21      while curd < 54:
22          curd = read_int()
23          if curd == -1:
24              sys.exit()
25          if curd > 36:
26              token = 100
27          else:
28              token = randint(1, 99)
29          print '{} {}'.format(1 + (curd % 18), token)
30          sys.stdout.flush()
31      badv = []
32      while curd < 72:
33          curd = read_int()
34          if curd == -1:
35              sys.exit()
36          v = 1 + (curd % 18)
37          print '{} {}'.format(v, 0)
38          sys.stdout.flush()
39          offset = 0
40          if curd <= 63:
41              offset = 1
42          badv.append((len(read_ints()) + offset, v))
43      badv = sorted(badv)
44      while True:
45          i, x = badv[0]
46          curd = read_int()
47          if curd == -1:
48              sys.exit()
49          print '{} {}'.format(x, randint(1, 99))
50          badv[0] = (i+1, x)
51          badv = sorted(badv)
52          sys.stdout.flush()
53          if curd == 95:
54              break
55      lv = rv = None
56      choice = None
57      while curd < 99:
58          curd = read_int()
59          if curd == -1:
60              sys.exit()
61          if not lv:
62              print '{} {}'.format(19, 0)
63              sys.stdout.flush()
64              lv = set(read_ints())
65              continue
66          elif not rv:
67              print '{} {}'.format(20, 0)
68              sys.stdout.flush()
69              rv = set(read_ints())
70              if not choice:
71                  if len(lv) > len(rv):
72                      choice = 19
73                  else:
74                      choice = 20
75              continue
76          print '{} {}'.format(choice, randint(1, 99))
77          sys.stdout.flush()
78      choice = OT[choice]
79      curd = read_int()
80      if curd == -1:
81          sys.exit()
82      print '{} {}'.format(choice, 100)
83      sys.stdout.flush()
84  def main():
85      T = int(raw_input())
86      for tc in xrange(1, T+1):
87          solve_test_case()
88  if __name__ == "__main__":
89      main()
```


**Question**: Which lines have control dependence over line `51` in function `solve_test_case`? List all such lines.

**Output**:


Ground truth answer: yes