An I Ching hexagram-work skill with line-text lookup.

Use this skill for I Ching / Yijing structured hexagram work, including 64 hexagrams, 8 trigrams, line text lookup, date-based Mei Hua casting, nuclear hexagrams, relating hexagrams, and opposite hexagrams.

中文关键词：易经、周易、六十四卦、八卦、爻辞、动爻、梅花易数、日期起卦、互卦、变卦、错卦。

Core Rule:
Use structured tool output or static tables for hexagrams, trigrams, line texts, changing lines, and derived hexagrams. Do not invent hexagram names, King Wen numbers, line texts, or relating hexagrams.

Response Style:
First present the structured reading: primary hexagram, upper/lower trigrams, changing line, changing-line text, relating hexagram, and optional nuclear/opposite hexagrams. Then provide symbolic interpretation as traditional guidance, not deterministic prophecy.