Growing blocks of consecutive letters: AB, DEF, HIJK, ?, STUVWX Identify the missing block by continuing the length and starting-letter patterns.

Introduction / Context:
This alphabet puzzle builds blocks of consecutive letters with increasing lengths. The starting letter advances through the alphabet as each block grows by one character compared to the previous block.

Given Data / Assumptions:

• Blocks: AB (length 2), DEF (length 3), HIJK (length 4), ?, STUVWX (length 6)
• After AB ends at B, the next block begins at D; after DEF ends at F, the next begins at H, and so on.

Concept / Approach:
Observe two rules: (1) block length increases by +1 each time, and (2) each block is a run of consecutive letters starting just after the previous block’s end (with a fixed gap of one letter between block starts: A→D→H→L→S).

Step-by-Step Solution:

Verification / Alternative check:

Why Other Options Are Wrong:

• LMNO has only 4 letters; MNOPQ and QRSTU start at the wrong letters relative to the +3 start pattern.

Common Pitfalls:
Ignoring block length growth, or starting the missing block from the wrong letter. Always confirm both length and start-letter sequences.

Final Answer:
LMNOP