Similar to Template:IsValidPageName
Template:Cite speech
Template:Cite speechTemplate:Cite SSRN
Template:Cite SSRNTemplate:Cite tech report
Template:Cite tech reportTemplate:Cite thesis ja
Template:Cite thesis/new
Template:Cite thesis/newTemplate:Cite thesis2
Template:Cite tweet
Template:Cite tweetTemplate:Cite tweet ja
Template:Cite web ja
Template:Cite web/German
Template:Cite web/GermanTemplate:Cite web/new
Template:Cite web/newTemplate:Cite web2
Template:Clade
Template:CladeTemplate:Clickable button 2
Template:Clickable button 2Template:Cmbox
Template:CmboxTemplate:Col-float
Template:Col-floatTemplate:Col-float-break
Template:Col-float-breakTemplate:Col-float-end
Template:Col-float-endTemplate:Collapsible list
Template:Collapsible listTemplate:College color boxes
Template:College color boxesTemplate:College color list
Template:College color listTemplate:College stripe style
Template:College stripe styleTemplate:CollegePrimaryHex
Template:CollegePrimaryHexTemplate:CollegePrimaryStyle
Template:CollegePrimaryStyleTemplate:Colored list
Template:ColorToLum
Template:Columns-list
Template:Columns-listTemplate:Comma separated entries2