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This is a parameter selection template. It returns the value of the parameter whose name is the value of parameter 1.
Usage
{{pst1|1|9|7}}? 1{{pst1|2|9|7}}? 9{{pst1|3|9|7}}? 7{{pst1|a|a=7|b=9}}? 7{{pst1|b|a=7|b=9}}? 9{{pst1|{{{1}}}=9}}? 9 - if parameter 1 is undefined the template returns the value of the parameter with the name "{{{1}}}".
m:Template:Pp is identical.