function(a)
    for unit in WA_IterateGroupMembers() do
        if (
            select(3, UnitClass(unit)) == 3
            or select(3, UnitClass(unit)) == 5
            or select(3, UnitClass(unit)) == 7
            or select(3, UnitClass(unit)) == 9
            or select(3, UnitClass(unit)) == 10
            or select(3, UnitClass(unit)) == 11
        )
        and not a[unit]
        then
            a[unit] = {
                show = true,
                changed = true,
            }
            --print("show", UnitName(unit))
        elseif a[unit] then
            a[unit].show = false
            a[unit].changed = true
        end
    end
    return true
end