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This is cool because it displays correct grammar depending on the number of options you input.

You have 0 options:

You have 0 option[!----]s[!----]:

---

You have 1 option:

You have 1 option[!--s[!----]:

---

You have 2 options:

You have 2 option[!----]s[!----]:

---

How to do conditionals

Include

[[include include-backend
|{$variable}=[!--
|condition=[!--@@--]
]]

Include Backend

[!--{$condition}--]@@@@
If TRUE, display this.
[!----]
{$condition}
ELSE, display this
[!----]

---

How to show only if condition is false

Include

[[include include-backend
|{$variable}=[!--
|condition=[!----]
]]

Include Backend

Normal text, normal text, {$condition}if FALSE, display this[!----] normal text.