Add Basic Concept

Basic-Concept.md

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+Concepts & Terms
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+Concept
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+Term
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+Upstream & Downstream
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+Hierarchy
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+Morpheme
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+Linguistic
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+Semantic
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+Calendars
+- Gregorian Calendar (GC)
+- Julian Calendar (JC)
+- Babylonian Calendar (BC)
+- Hebrew Calendar (HC)
+- International Fixed Calendar > 
+- Good Governance Calendar (GGC)
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