Coding — What is the code for 'sure'? Statements: I. 'he is sure' → 'ja ha main'. II. 'is she sure' → 'ka ja main'.

Introduction / Context:
Identify the unique codeword for 'sure' from two coded sentences.

Given Data / Assumptions:

• S1: 'he is sure' ↔ {ja, ha, main}.
• S2: 'is she sure' ↔ {ka, ja, main}.

Concept / Approach:
Common English words across the sentences are {is, sure}. The common codes are {ja, main}. Without an additional sentence breaking the tie, we cannot tell which of {ja, main} maps to 'sure' and which to 'is'.

Step-by-Step Solution:

Verification / Alternative check:
Try to use the unique words (he ↔ ha in S1; she ↔ ka in S2). These do not help distinguish between 'ja' and 'main' for 'sure'.

Why Other Options Are Wrong:

• I alone / II alone: insufficient because multiple bijections exist.
• Either alone sufficient / Both together sufficient: contradicted by two valid mappings.

Common Pitfalls:
Assuming alphabetical or positional mapping; presuming 'main' must mean 'is' due to meaning (semantics are irrelevant in this puzzle).

Final Answer:
Both Statements I and II together are not sufficient.