Complete the series by selecting one ordered 4-letter set to fill the blanks: H__J H__I J H H I__H H__J H

Introduction / Context:
Here we again place a single ordered 4-letter option into four blanks to restore a global repeating structure. The pattern is closely related to the HIJH cycle, a common building block in letter-series problems that repeat a 4-letter motif.

Given Data / Assumptions:

• Skeleton: H _ _ J H _ _ I J H H I _ _ H H _ _ J H
• Letters must be inserted in order from the chosen option.

Concept / Approach:
Based on the mix of visible H, I, and J, a natural hypothesis is the HIJH repeating cycle. The goal is to verify which choice placed left-to-right yields blocks that align with HIJH across the line without contradictions.

Step-by-Step Solution:
1) Try option “I H I J”.2) Insert I at the first blank, giving H I _ J, which is consistent with HIJH (expecting HIJH…).3) Insert H at the second blank to complete H I H J; nearby letters then support leading into H I J H in the next segment.4) Insert I at the third blank (in the H__I zone), maintaining …H I J H / H I… continuity.5) Insert J at the fourth blank in the latter part, closing the final HIJH block.

Verification / Alternative check:
After all placements, segment the completed string and confirm you can partition it (with overlaps) into HIJH groups. The option “I H I J” uniquely preserves this across all four insertions.

Why Other Options Are Wrong:

• I H J I: Swaps the last two letters, breaking the tail closure.
• H I H I / H J H J: These produce alternating pairs but fail to synchronize the visible J and I anchors into HIJH blocks.

Common Pitfalls:
Filling early blanks by local fit and neglecting the later overlaps. Always test all four placements end-to-end and look for a single repeating macro-motif.

Final Answer:
I H I J