diff --git a/1FundamentalGroup/Quest0Solutions.agda b/1FundamentalGroup/Quest0Solutions.agda
index 5ed9fea..2a85daf 100644
--- a/1FundamentalGroup/Quest0Solutions.agda
+++ b/1FundamentalGroup/Quest0Solutions.agda
@@ -18,14 +18,14 @@ Flip true = false
 -- notice we used `refl` instead of `λ i → false`,
 -- more on `refl` in Quest1
 flipIso : Bool ≅ Bool
-flipIso = iso Flip Flip s r where
-  s : section Flip Flip
-  s false = refl
-  s true = refl
+flipIso = iso Flip Flip rightInv leftInv where
+  rightInv : section Flip Flip
+  rightInv false = refl
+  rightInv true = refl
 
-  r : retract Flip Flip
-  r false = refl
-  r true = refl
+  leftInv : retract Flip Flip
+  leftInv false = refl
+  leftInv true = refl
 
 flipPath : Bool ≡ Bool
 flipPath = isoToPath flipIso
diff --git a/1FundamentalGroup/feedbackG.md b/1FundamentalGroup/feedbackG.md
index fef11b3..9825375 100644
--- a/1FundamentalGroup/feedbackG.md
+++ b/1FundamentalGroup/feedbackG.md
@@ -35,10 +35,10 @@
 [x] overall : need to be clearer that `Type` is space of spaces,
   and paths in `Type` are saying which spaces are the same.
 
-## Quesst0/Part2
+## Quest0/Part2
 
-[] For the `iso` bit, change to just `C-c C-r` cuz `Iso` only has one constructor.
-[] say you can check def of `Iso` by using `SPC c d`
-[] say "just write `s` and `r` and write the rest then load".
-[] emphasize agda is indentation sensitive.
-[] subject unexpectedly extracts lemma `true ≡ true`.
+[x] For the `iso` bit, change to just `C-c C-r` cuz `Iso` only has one constructor.
+[x] say you can check def of `Iso` by using `SPC c d`
+[x] say "just write `s` and `r` and write the rest then load".
+[x] emphasize agda is indentation sensitive.
+[x] subject unexpectedly extracts lemma `true ≡ true`.
diff --git a/_build/2.6.2/agda/1FundamentalGroup/Quest0Solutions.agdai b/_build/2.6.2/agda/1FundamentalGroup/Quest0Solutions.agdai
index 546998d..88594b3 100644
Binary files a/_build/2.6.2/agda/1FundamentalGroup/Quest0Solutions.agdai and b/_build/2.6.2/agda/1FundamentalGroup/Quest0Solutions.agdai differ