heading

hejkhkfhhfwh

_^text edit source text

reference ^[1]

reference again^[1]

referebce 2^[2]

reference 3^[3]

reference repeat^{[group 1]}

ref

referenceCite error: Invalid <ref> tag; refs with no name must have content; see the help page ().

groupref^{[group 2]}

emptyrefCite error: Invalid <ref> tag; refs with no content must have a name; see the help page ().

$\sqrt{π}$

^ ^a ^b ^c Cite error: Invalid <ref> tag; no text was provided for refs named :0; see Help:Cite errors/Cite error references no text ().
^ 3