LS-008

Find the next letter: C – D – F – G – I – ?

Rule: Two interleaved sequences. The next letter continues the odd-position stream.

So the next letter is J.

• Picking the first pattern you see without checking it against all rows/columns.
• Ignoring the simplest rule (counts, rotations, alternations) and jumping to a complex story.
• Not testing your rule on the middle row/column (where many puzzles “break” bad rules).