modified:   explainer.scm
	modified:   knowledgebase.scm
	modified:   main.scm
	new file:   querier.scm
	fix a typo
	modified:   main.scm
	modified:   querier.scm

	modified:   explainer.scm
	Final version, I suppose.
	modified:   explainer.scm
	modified:   main.scm