diff --git a/rust-whisper-baked/src/main.rs b/rust-whisper-baked/src/main.rs
index dd96f1d..cf9cd9f 100644
--- a/rust-whisper-baked/src/main.rs
+++ b/rust-whisper-baked/src/main.rs
@@ -100,8 +100,8 @@ impl Destutterer {
       let next_words = Words::from_string(next.clone());
       let mut n = self.prevs.len().clamp(0, next_words.len());
       while n > 0 {
-         let prev_s = (self.prevs.len()-n..self.prevs.len()).map(|i| self.prevs.comparable_string(i)).collect().join(" ");
-         let next_s = (0-n).map(|i| next_words.comparable_string(i)).collect().join(" ");
+         let prev_s, _ = self.prevs.last_n_comparable_to_string(n);
+         let next_s, _ = next_words.first_n_comparable_to_string(n);
          eprintln!("prevs => '{}'", &prev_s);
          eprintln!("nexts => '{}'", &next_s);
          if prev_s == next_s {