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diff --git a/guide/challenge-bot-questions.org b/guide/challenge-bot-questions.org
index 36c7f8e..0962fd7 100644
--- a/guide/challenge-bot-questions.org
+++ b/guide/challenge-bot-questions.org
@@ -30,10 +30,10 @@
     to attach the motor to the deck, first we attached motor mounts.
     the motor mounts are the square things with 6 holes of
     various sizes.
-    1. the bolts used to attach the arduino are 6-32 bolts.
+    1. the bolts used to attach the arduino are =6-32= bolts.
        the bolts used to attach the motor to the motor mount are
-       4-40 bolts.
-       Are the 4-40 bolts fatter or thinner than the 6-32?
+       =4-40= bolts.
+       Are the =4-40= bolts fatter or thinner than the =6-32=?
     2. if you see a bolt described as =4-40x1.25=" how long is it?
     3. on a =4-40= bolt, how many times does the thread wrap around
        one inch of the body?