small prompt change.

copienator/commands/gemini_for_labels.py

@@ -42,6 +42,13 @@ The image consists of several columns, separated by vertical black
 lines. The image should be read top to bottom and then left to right,
 meaning first column, then second column, etc.
 
+Carry the current exercise number across column and page boundaries. A
+bare question number such as `2)` is most likely to belong to the most
+recent exercise heading in reading order unless a new heading changes
+the exercise. For example, if a column ends with `Ex 11 : 1)` and the
+next starts with `2)` without a new exercise heading, label it `Ex 11
+: 2)`.
+
 In their sheet, students delimit exercises and questions using
 delimiters such as `Ex 1`, or `Exercice 1`, and `1)` or `a)`. You need
 to give me the bounding boxes of each delimiter.
@@ -95,6 +102,13 @@ The image consists of several columns, separated by vertical black
 lines. The image should be read top to bottom and then left to right,
 meaning first column, then second column, etc.
 
+Carry the current exercise number across column and page boundaries. A
+bare question number such as `2)` is likely to belong to the most
+recent exercise heading in reading order unless a new heading changes
+the exercise. For example, if a column ends with `Ex 11 : 1)` and the
+next starts with `2)` without a new exercise heading, label it `Ex 11
+: 2)`. 
+
 In their sheet, students delimit exercises and questions using
 delimiters such as `Ex 1`, or `Exercice 1`, and `1)` or `a)`. You need
 to give me the bounding boxes of each delimiter.