diff --git a/.gitignore b/.gitignore
index 908fcb0..e359ec8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,3 +20,5 @@ run_nagini.py
 /tmp
 results
 results/*
+/log_tries/
+/log_tries/*
diff --git a/benchesResults/Nagini-Bench/tries_16_09.json b/benchesResults/Nagini-Bench/tries_16_09.json
deleted file mode 100644
index ed720cb..0000000
--- a/benchesResults/Nagini-Bench/tries_16_09.json
+++ /dev/null
@@ -1,43 +0,0 @@
-{
-  "005-intersperse.py": 4,
-  "009-rolling-max.py": 3,
-  "011-string_xor.py": 2,
-  "016-count_distinct_characters.py": 2,
-  "023-strlen.py": 0,
-  "024-largest-divisor.py": 2,
-  "027-flip_case.py": 3,
-  "029-filter_by_prefix.py": 3,
-  "035-max-element.py": 4,
-  "041-car_race_collision.py": 0,
-  "042-incr-list.py": 2,
-  "046-fib4.py": 3,
-  "050-encode_shift.py": 2,
-  "052-below-threshold.py": 2,
-  "053-add.py": 0,
-  "054-same-chars.py": 0,
-  "055-fib.py": 2,
-  "059-largest-prime-factor.py": 2,
-  "060-sum-to-n.py": 5,
-  "062-derivative.py": 2,
-  "063-fibfib.py": 4,
-  "066-digitSum.py": 4,
-  "082-prime-length.py": 2,
-  "083-starts_one_ends.py": 0,
-  "084-solve.py": 2,
-  "085-add.py": 2,
-  "092-any_int.py": 0,
-  "093-encode.py": 2,
-  "097-multiply.py": 0,
-  "098-count_upper.py": 3,
-  "100-make_a_pile.py": 3,
-  "110-exchange.py": 0,
-  "121-solution.py": 2,
-  "127-intersection.py": 0,
-  "134-check_if_last_char_is_a_letter.py": 0,
-  "138_is_equal_to_sum_even.py": 0,
-  "139-special_factorial.py": 3,
-  "146_specialFilter.py": 5,
-  "150-x_or_y.py": 4,
-  "157-right_angle_triangle.py": 0,
-  "159-eat.py": 0
-}
\ No newline at end of file
diff --git a/verified_cogen/tools/verifier.py b/verified_cogen/tools/verifier.py
index 274a14b..b11aa5a 100644
--- a/verified_cogen/tools/verifier.py
+++ b/verified_cogen/tools/verifier.py
@@ -15,13 +15,20 @@ def __init__(self, shell: str, verifier_cmd: str, timeout: int = 60):
         self.timeout = timeout
 
     def verify(self, file_path: Path) -> Optional[tuple[bool, str, str]]:
-        proc = subprocess.Popen(
-            [self.shell, "-i", "-l", "-c", f'{self.verifier_cmd} "{file_path}"'],
-            stdout=subprocess.PIPE,
-            stderr=subprocess.PIPE,
-        )
         try:
-            out, err = proc.communicate(timeout=self.timeout)
-            return proc.returncode == 0, out.decode(), err.decode()
+            res = subprocess.run(
+                '{} -i -l -c "{} "{}""; exit'.format(
+                    self.shell, self.verifier_cmd, file_path
+                ),
+                capture_output=True,
+                shell=True,
+                timeout=self.timeout,
+            )
         except subprocess.TimeoutExpired:
-            os.killpg(os.getpgid(proc.pid), signal.SIGTERM)
+            os.system("killall z3")
+            return None
+        return (
+            res.returncode == 0,
+            res.stdout.decode("utf-8"),
+            res.stderr.decode("utf-8"),
+        )