Module:Tone superscript

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local p = {
	main = main,
}

function p.main(frame)
	local root=mw.html.create()
	local arg=frame:getParent().args[1]
	if not arg or arg:len()==0 then
		root:tag('strong'):attr('class','error'):wikitext('Error: None pronunciation.')
		return tostring(root)
	end
	local x=arg:gsub("(%d)","<sup>%1</sup>")
	x=x:gsub("(%d)</sup>%*<sup>(%d)","%1*%2")
	root:tag('span'):wikitext(x)
	return tostring(root)
end

return p