Coding — How is 'must' written in the code language? Statements: I. 'you must see' → 'la pa ni' and 'did you see' → 'jo ni pa'. II. 'you did that' → 'pa si jo'.

Introduction / Context:
Determine the unique code for the word 'must' from coded sentences.

Given Data / Assumptions:

• S1: 'you must see' ↔ {la, pa, ni}.
• S2: 'did you see' ↔ {jo, ni, pa}.
• S3 (II): 'you did that' ↔ {pa, si, jo}.

Concept / Approach:
Use overlaps to isolate the remaining token corresponding to 'must'.

Step-by-Step Solution:

Verification / Alternative check:
Any reassignment contradicts the bijection within S1 and the overlap with S2.

Why Other Options Are Wrong:

• II alone: Does not include 'must'; cannot isolate it.
• Either alone / Both together not sufficient / Both together sufficient: inconsistent with the deduction above.

Common Pitfalls:
Assuming fixed token ordering; overlooking that the intersection {you, see} pins two codes, leaving 'la' for 'must'.

Final Answer:
Statement I alone is sufficient; 'must' = 'la'.