Explanation:

- The given letter series is structured around repeating patterns.

- Identify the pattern present in the sequence segments: "o M o N" repeats.

- Analyzing the sequence: "_ M o N _ _ _ o M _ _ o _ _o M _ N o J o" shows missing segments to complete the pattern.

- Look for repetition of the identified pattern "o M o N" followed by a variation.

- The options should fit this repeated pattern, ensuring the sequence reads smoothly when complete.

Option 1: o o J o o N J o M

- Incompatible with complete repeating pattern.

- Breaks the sequence consistency.

Option 2: o o J o o N J o o

- Matches repetition of "o M o N" with a correct continuation of the sequence afterward.

- Consistent with observed pattern repetition.

Option 3: o M J o o N J o o

- Incorrect, introduces unmatched "M" breaking the pattern consistency.

Option 4: M o J o o N J o o

- Starts wrongly with "M" which disrupts initial sequence expectation.

Answer: Option 2 is correct, completing the series accurately.

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