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-- Written by Shining-Armor
 
local p = {}
 
function p.empty( s )
    if s == nil or s == '' then 
        return true
    else
        return false
    end
end
 
function p.dual( frame )
    if not p.empty( frame.args[1] ) then
        return frame.args[1]
    elseif not p.empty( frame.args[2] ) then
        return frame.args[2]
    else
        return ''
    end
end
 
return p

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