diff --git a/faq.md b/faq.md
new file mode 100644
index 0000000..b54b623
--- /dev/null
+++ b/faq.md
@@ -0,0 +1,8 @@
+### Why is `Coroutine[Any, Any, T]` used instead of `Awaitable[T]`?
+* Typing issues (PyCharm)
+* Explicit expression of whether some sort of action is performed or not (tasks vs futures vs coros)
+
+### Why is `subset-verify-optimized` branch closed?
+* Performance gain at large set sizes are 0% or less.
+* Performance gain with caching is always negative.
+* Using merge-based optimization is assumed to be even less practical.
diff --git a/rainbowadn/testing/test_bridge.py b/rainbowadn/testing/test_bridge.py
index 74b622c..c8fb2e3 100644
--- a/rainbowadn/testing/test_bridge.py
+++ b/rainbowadn/testing/test_bridge.py
@@ -110,18 +110,20 @@ class TestBridge(unittest.IsolatedAsyncioTestCase):
 
     async def test_flowstandard(self):
         set_gather_linear()
-        set0 = {os.urandom(8).hex().encode() for _ in range(64)}
+        set0 = {os.urandom(8).hex().encode() for _ in range(512)}
         abt0: ActiveBinaryTree[Plain, Integer] = await self.abt_of(*set0)
         abt1: ActiveBinaryTree[Plain, Integer] = abt0
-        for _ in range(16):
+        for _ in range(32):
             abt1 = await abt1.add(HashPoint.of(Plain(os.urandom(8).hex().encode())))
         fs0 = FlowStandard(abt0.protocolized())
         fs1 = FlowStandard(abt1.protocolized())
         _t = time.process_time()
-        await fs0.verify_subset(UnitReducer(fs1))
+        for _ in range(16):
+            await fs0.verify_subset(UnitReducer(fs1))
         with self.assertWarns(RuntimeWarning):
-            with self.assertRaises(ValueError):
-                await fs1.verify_subset(UnitReducer(fs0))
+            for _ in range(16):
+                with self.assertRaises(ValueError):
+                    await fs1.verify_subset(UnitReducer(fs0))
         print('verification time', time.process_time() - _t)
 
     async def test_flow13(self):
diff --git a/trace_flow.py b/trace_flow.py
index 1758f8a..78a35f6 100644
--- a/trace_flow.py
+++ b/trace_flow.py
@@ -75,14 +75,9 @@ async def _instrument(process: Callable[[], Coroutine[Any, Any, None]]) -> list[
 
 
 async def _process(bank: BankBlock) -> None:
-    assert_true(await bank.verify())
-    print('processed')
-
-
-async def _pre_measure(bank: BankBlock):
     with Measure(bank, 'verify') as measurement:
-        await _process(bank)
-    print('pre-measured', *(f'{t:.3f}' for t in measurement.log))
+        assert_true(await bank.verify())
+    print('measured', *(f'{t:.3f}' for t in measurement.log))
 
 
 async def _trace(params):
@@ -92,7 +87,7 @@ async def _trace(params):
         *params['subjects'],
         *params['transactions'],
     )
-    await _pre_measure(bank)
+    await _process(bank)
     bank = await _migrate(bank, params)
     set_gather_asyncio()
     with DeintrumentationSize(Instrumentation, 'deinstrument'):
@@ -120,6 +115,6 @@ preset_old = dict(blocks=16, subjects=(8, 15), transactions=(8, 15), caching=Fal
 if __name__ == '__main__':
     asyncio.run(
         trace(
-            preset_short
+            preset_long
         )
     )