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This is an auxiliary template allowing to encode " | " within template parameters. It is unnecessary to get a " | " in these cases, better use " | " for this purpose. However the " | " delimiter for a Wiki table has to be escaped by a template if it's used within a template, see also WP:QIF .

Note that there's no such problem with " ! " (exclamation mark), it only affects " | " (vertical bar) in conjunction with the m:Help:Parameter_default mechanism within tables.

For obvious reasons this is a high risk template , and it cannot be substituted .

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