diff --git a/.talismanrc b/.talismanrc
index eba24af..423c319 100644
--- a/.talismanrc
+++ b/.talismanrc
@@ -3,5 +3,7 @@ fileignoreconfig:
   checksum: f2e4da4dfc22981641fe21b13c8cef755785845c1431427b3312ca6558251a21
 - filename: test/helpers/bats-support
   checksum: 2076897e3d8d1a27b5d649ebdf9637ea9de70464a8c45346e9054689157c1db3
+- filename: redactor/src/main.rs
+  checksum: ee591091d4fd625a98dd33fe1ec8a31a15e2a57a3123c3595722834e63d9df0c
 allowed_patterns:
 - pwd
diff --git a/redactor/src/main.rs b/redactor/src/main.rs
index 8b58e44..9f102d5 100644
--- a/redactor/src/main.rs
+++ b/redactor/src/main.rs
@@ -1,28 +1,31 @@
 use std::io::{self, BufRead, Write, Result};
 
-pub fn redactor<R, W>(input: R, mut output: W, num_digits: usize)
+pub fn redactor<R, W>(input: R, mut output: W)
     where
         R: BufRead,
         W: Write,
 {
-    let mut mask = String::new();
-    for _ in 0..num_digits {
-        mask.push('#');
-    }
+    const NUM_DIGITS: usize = 10;
+    let mask = "[REDACTED]";
 
     for maybe_line in input.lines() {
         let mut line = fetch_next_line(maybe_line);
-        let sequences = find_digit_sequences(num_digits, &line);
+        let sequence_positions = find_digit_sequences(NUM_DIGITS, &line);
 
-        for sequence in &sequences {
-            let redaction_end = sequence + num_digits;
-            line.replace_range(sequence..&redaction_end, &mask);
+        for sequence_position in &sequence_positions {
+            if is_not_in_uuid(sequence_position, &line) {
+                line.replace_range(sequence_position..&(sequence_position + NUM_DIGITS), &mask);
+            }
         }
         write!(&mut output, "{}", line).expect("failed to write");
     }
     ()
 }
 
+pub fn is_not_in_uuid(ten_digit_start_position: &usize, line: &String) -> bool {
+    true
+}
+
 fn fetch_next_line(maybe_line: Result<String>) -> String {
     let mut line = maybe_line.expect("Failed to read line");
     line.push('\n');
@@ -52,7 +55,7 @@ fn main() {
 
     let output = io::stdout();
 
-    redactor(input, output, 10);
+    redactor(input, output);
 }
 
 #[cfg(test)]
@@ -62,21 +65,21 @@ mod tests {
 
     #[test]
     fn test_replaces_digits_with_redaction_message() {
-        let input = b"123\n";
+        let input = b"1234567890\n";
         let mut output = Vec::new();
 
-        redactor(&input[..], &mut output, 3);
+        redactor(&input[..], &mut output);
 
         let output_str = String::from_utf8(output).expect("Not UTF-8");
 
-        assert_eq!("###\n", output_str);
+        assert_eq!("[REDACTED]\n", output_str);
     }
 
     #[test]
     fn test_does_not_replace_non_digits() {
         let mut output = Vec::new();
 
-        redactor(&b"abc\n"[..], &mut output, 3);
+        redactor(&b"abc\n"[..], &mut output);
 
         assert_eq!("abc\n", String::from_utf8(output).unwrap());
     }
@@ -85,80 +88,89 @@ mod tests {
     fn test_replaces_only_digits() {
         let mut output = Vec::new();
 
-        redactor(&b"a123b\n"[..], &mut output, 3);
+        redactor(&b"a1234567890b\n"[..], &mut output);
 
-        assert_eq!("a###b\n", String::from_utf8(output).unwrap());
+        assert_eq!("a[REDACTED]b\n", String::from_utf8(output).unwrap());
     }
 
     #[test]
     fn test_does_not_replace_fewer_digits_than_intended() {
         let mut output = Vec::new();
 
-        redactor(&b"a12bc\n"[..], &mut output, 3);
+        redactor(&b"a123456789bc\n"[..], &mut output);
 
-        assert_eq!("a12bc\n", String::from_utf8(output).unwrap());
+        assert_eq!("a123456789bc\n", String::from_utf8(output).unwrap());
     }
 
     #[test]
     fn test_does_not_replace_more_digits_than_intended() {
         let mut output = Vec::new();
 
-        redactor(&b"a1234bc\n"[..], &mut output, 3);
+        redactor(&b"a12345678904bc\n"[..], &mut output);
 
-        assert_eq!("a1234bc\n", String::from_utf8(output).unwrap());
+        assert_eq!("a12345678904bc\n", String::from_utf8(output).unwrap());
     }
 
     #[test]
     fn test_replaces_multiple_occurrences_on_line() {
         let mut output = Vec::new();
 
-        redactor(&b"abc123de456fgh789xyz\n"[..], &mut output, 3);
+        redactor(&b"abc1234567890de1112223334fgh7778889990xyz\n"[..], &mut output);
 
-        assert_eq!("abc###de###fgh###xyz\n", String::from_utf8(output).unwrap());
+        assert_eq!("abc[REDACTED]de[REDACTED]fgh[REDACTED]xyz\n", String::from_utf8(output).unwrap());
     }
 
     #[test]
     fn test_replaces_digits_at_start_of_line() {
         let mut output = Vec::new();
 
-        redactor(&b"123abc\n"[..], &mut output, 3);
+        redactor(&b"1234567890abc\n"[..], &mut output);
 
-        assert_eq!("###abc\n", String::from_utf8(output).unwrap());
+        assert_eq!("[REDACTED]abc\n", String::from_utf8(output).unwrap());
     }
 
     #[test]
     fn test_replaces_digits_at_end_of_line() {
         let mut output = Vec::new();
 
-        redactor(&b"abc123\n"[..], &mut output, 3);
+        redactor(&b"abc1234567890\n"[..], &mut output);
 
-        assert_eq!("abc###\n", String::from_utf8(output).unwrap());
+        assert_eq!("abc[REDACTED]\n", String::from_utf8(output).unwrap());
     }
 
     #[test]
     fn test_includes_fewer_that_intended_digits_at_end_of_line() {
         let mut output = Vec::new();
 
-        redactor(&b"abc12\n"[..], &mut output, 3);
+        redactor(&b"abc123456789\n"[..], &mut output);
 
-        assert_eq!("abc12\n", String::from_utf8(output).unwrap());
+        assert_eq!("abc123456789\n", String::from_utf8(output).unwrap());
     }
 
     #[test]
     fn test_replaces_digits_on_multiple_lines() {
         let mut output = Vec::new();
 
-        redactor(&b"abc123\n456def789\n"[..], &mut output, 3);
+        redactor(&b"abc1234567890\n4567890123def7890123456\n"[..], &mut output);
 
-        assert_eq!("abc###\n###def###\n", String::from_utf8(output).unwrap());
+        assert_eq!("abc[REDACTED]\n[REDACTED]def[REDACTED]\n", String::from_utf8(output).unwrap());
     }
 
     #[test]
     fn test_copes_with_multiple_runs_of_shorter_digits() {
         let mut output = Vec::new();
 
-        redactor(&b"abc12__34__56\n"[..], &mut output, 3);
+        redactor(&b"abc12__34__56\n"[..], &mut output);
 
         assert_eq!("abc12__34__56\n", String::from_utf8(output).unwrap());
     }
+
+    // #[test]
+    // fn test_recognises_that_ten_digit_sequence_is_in_uuid_when_position_is_at_start_of_last_sequence_of_a_uuid() {
+    //     let single_uuid_line = String::from("2523fa52-1719-4300-9bb0-321612e7393a");
+    //     let in_uuid = !is_not_in_uuid(&24, &single_uuid_line);
+    //
+    //     assert_eq!(single_uuid_line.chars().nth(24).unwrap(), '3');
+    //     assert_eq!(in_uuid, true);
+    // }
 }