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In page Shang dynasty:

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The Shang believed that their ancestors held power over them and performed divination rituals to secure their approval for planned actions.[4] Divination involved cracking a turtle carapace or ox scapula to answer a question, and to then record the response to that question on the bone itself.[1] It is unknown what criteria the diviners used to determine the response, but it is believed to be the sound or pattern of the cracks on the bone.[citation needed]