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Compare character sets in two strings
Tutor me on https://mlprep.iwase.dev/item/mit-6-100l-finger-08/. This is a practice item. If window.mlPrepAgent is available, read attempts for item mit-6-100l-finger-08 before tutoring. Inspect my attempt, keep the item ID, and do not reveal the full answer first. After a real attempt, append its record with recorded_by agent, include agent_session_id when available, and read it back.Tests bidirectional membership reasoning rather than only one pass over one string.
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