overview core models message variable appendix

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KO

00-overview
10-gem-core
20-advanced-models
30-message-reference
40-variable-reference
80-appendix
GemAtlas

00-overview
10-gem-core
20-advanced-models
30-message-reference
40-variable-reference
80-appendix
GemAtlas

40-variable-reference

40-variable-reference