Template:123
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{{ {{{1}}}}}
{{ 123 | text | txt1... | ...txt3 }} gives {{ text|txt1...|...txt3}}
{{123}} imitates the output of and various other templates for arbitrary text, or in other words text doesn't need to be a template and isn't shown as link.
123 is a mnemonic, { has roughly the same effect as <nowiki>{</nowiki> in places where simply using "{" isn't possible, and it's also a hint that more than three additional strings txt1 up to txt aren't supported (just to keep the code simple).
Optional substitution {{subst:123|text|txt1...tx3|subst=subst:}} is supported. Normal substitution {{subst:123}} substitutes the code, useful to create similar templates without calling 123, otherwise a bad idea.
