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To avoid major disruption and server load, any changes should be tested in the template's /sandbox or /testcases subpages, or in your own user subpage. The tested changes can be added to this page in a single edit. Consider discussing changes on the talk page before implementing them.
This is an auxiliary template that allows one to encode "
||" (two pipes or vertical bars) within template parameters. If this does not need to be interpreted as wikitext (i.e. table cell separators), it is better to use "
||". However the "
||" delimiter for a wikitable has to be escaped by a template if it is used within a template.
There is usually no such problem with "
!!" (exclamation marks). This problem only affects "
||" (vertical bars) in conjunction with the m:Help:Parameter default mechanism within tables. However, in table rows starting with "
!" there can be problems with "
!!" being interpreted as a cell separator. Try replacing it with "
This template cannot be substituted.
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