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<includeonly>{{#ifexpr:{{{1}}}>0|{{Centurybox/nthcent|{{{1}}}|{{{2|AD}}}|cm={{{cm|century}}}|bc={{{bc|BC}}}}}|{{Centurybox/nthcent|{{#expr:1-{{{1}}}}}|{{#switch:{{{2|AD}}}|AD=BC|BC=AD}}|cm={{{cm|century}}}|bc={{{bc|BC}}}}}}}</includeonly><noinclude>This template corrects any century number less than one then passes parameters on to {{tl|Centurybox/nthcent}} which, in turn converts {{{1}}} to ''{{{1}}}th century (BC)'' (''BC'' is included iff {{{2}}}=''BC'') allowing for alternatives to ''century'' & ''BC'' (respective defaults of {{{cm}}} & {{{bc}}}).</noinclude>