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{{#ifeq:{{#invoke:A|getCategories|pageName=A}}|A||[[Category:A]]}}
{{#ifeq:{{#invoke:A|getCategories|pageName=A}}|B|We are in B|We are not in B, but now we are [[Category:B]]}}
{{#ifeq:{{#invoke:A|getCategories|pageName=A}}|B|We are already in B [[Category:A]]|We are not}}