Changes

{{!}}
<noinclude>{{pp-template|small=yes}}</noinclude><includeonly>{{#ifeq: {{NAMESPACE}} | Category |<!--
-->{{#if: {{#invoke:String|match|{{BASEPAGENAME}}|%d+[snrt][tdh]%-century.+$|ignore_errors=true}}<!--
-->|<!-- it's on a century category
-->{{#if: {{#invoke:String|match|{{{1|}}}|{{#invoke:String|match|{{BASEPAGENAME}}|-century.+$|ignore_errors=true}}|ignore_errors=true|plain=true}}<!--
-->|<!-- the link is to a similar century category
-->[[Category:Template Category see also used when Template Category pair probably should be]]<!--
-->}}<!--
-->}}<!--
-->}}</includeonly><noinclude>
{{doc|content=
Check whether [[Template:Category see also]] has been used when [[Template:Category pair]] probably should be use.

The test is:
#Is this page in the Category namespace?
#Does this page's title end in "nn(st{{!}}nd{{!}}rd{{!}}th)-century something"
#does the first linked cat's title end in the same "-century something" as the title of the page it is used on?

If the answer to all 3 is yes, then categorise the page in the hidden tracking category [[:Category:Template Category see also used when Template Category pair probably should be]]
}}</noinclude>
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