Assertion: obsidian's pattern | /r/HasProperty | 1the cultural readaptations
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Source sentences:
text: The picture presented by the culture history of the earlier portion of the Holocene Period is thus one of two generalized developmental patterns: (1) the cultural readaptations to post-Pleistocene environments on a more or less intensified level of food collection; and (2) the appearance and development of an effective level of food production.