A Liu Yao casting tutorial for three-coin hexagram reading.

1. Teach me, in a beginner-friendly Liu Yao (Six Lines) way, how to cast a hexagram with three coins. Explain: how to determine the yin/yang face before casting, how to cast six times in a row, how to arrange from the first line to the top line, and how to record the primary hexagram and moving lines.
2. I want to cast a Liu Yao hexagram with coins. Tell me whether the three coins must be exactly identical, which differences are acceptable, and which rules must be consistent, and explain why not to add extra intermediate variables.
3. Help me make a pre-casting rules checklist for Liu Yao: coin selection, yin/yang face determination, question wording, casting environment, recording method, and the principle that the hexagram cannot be changed after casting.
4. Explain in beginner-friendly language: why must you decide which face is yang and which is yin before casting, and why you cannot change it temporarily after deciding?
5. Organize "silently recite and confirm the question before casting" into a Liu Yao question ritual, simple, stable, and not overly mystical.
6. Generate a Liu Yao casting record template including: question, casting time, coin rules, six cast results, each line's yin/yang, moving lines, primary hexagram, changed hexagram, initial imagery, and later verification.