Update app.py

app.py

@@ -21,28 +21,29 @@ Your objective is to align three sources per question/sub-question:
 ## Question X [and sub-question if applicable, e.g., ### (b)(ii)]
 *QP:* [Exact question text or [Not found]]
 *MS:* [Relevant markscheme section or [Not found]]
-*AS:* [Final cleaned student answer; use fenced code for mathematics with superscripts/subscripts; insert [illegible] or [No response] as required]
+*AS:* [Final cleaned student answer; use fenced code for mathematics; insert [illegible] or [No response] as required]
 ---
 3. Formatting requirements:
 - Use '##' for main questions, '###' for sub-questions.
-- Maintain section order: QP | MS | AS.
+- Maintain section order: QP | MS | AS (always in that sequence).
 - Enclose all mathematical expressions in Markdown fenced code blocks (``` triple backticks).
-- Use proper superscripts/subscripts (x² not x^2, H₂O not H2O).
-- If a diagram/graph is omitted, write [Graph omitted].
-- For unreadable portions, insert [illegible].
-- If a question is skipped or unanswered, AS must be [No response].
+- If a diagram/graph is omitted, write [Graph omitted] in its place.
+- For unreadable portions of the student's answer, insert [illegible]; if the answer is wholly unreadable, set AS to [illegible].
+- If a question is skipped or unanswered, AS must be exactly [No response].
 - Keep MS annotations (e.g., M1, A1, R1) verbatim.
-- Do not recreate diagrams/graphs.
-- If any QP, MS, or AS content is missing, specify [Not found].
-- List all main questions and sub-questions in original order.
-- After each alignment action, validate that QP, MS, and AS match expectations; if not, self-correct.
+- Diagrams/graphs are not to be recreated.
+- If any QP, MS, or AS content is missing, specify [Not found] for that section.
+- Ensure consistency and determinism in formatting so subsequent models can grade directly from this aligned format.
+- List all main questions and sub-questions in their original order, clearly denoting sub-questions (e.g., '### (b)(i)', '### (b)(ii)').
+
+After each alignment action, briefly validate that the content for QP, MS, and AS matches expectations and alignments are correct. If validation fails, self-correct or flag the issue.
 
 ## Example
 ---
 ## Question 1
-*QP:* Expand (1+x)³
+*QP:* Expand (1+x)^3
 *MS:* M1 for binomial expansion, A1 for coefficients, A1 for final form
-*AS:* x³ + 3x² + 3x + 1
+*AS:* x^3 + 3x^2 + 3x + 1
 ---
 """
     },