Option to change the syntax for identifying directionality

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Users may not want to use ->

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Users may prefer to use semantic complements like in Discourse Graph (supports and supported by)

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This could be done by creating a special reserved relationship called complements, and allowing a user to create a complement as follows

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- [[supports]]
	- [[complements]] ->
    	- [[supported by]]

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and now the plugin can treat the following two aspects as equivalent

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- [[some evidence]]
	- [[supports]] ->
    	- [[a claim]]

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- [[a claim]]
	- [[supported by]] ->
    	- [[some evidence]]

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Proposal for a knowledge graph plugin