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SVG.extend(SVG.Parent, {
flatten: function (parent) {
if (this instanceof SVG.Defs) return this
parent = parent || (this instanceof SVG.Doc ? this : this.parent(SVG.Parent))
this.each(function () {
if (this instanceof SVG.Defs) return this
if (this instanceof SVG.Parent) return this.flatten(parent)
return this.toParent(parent)
})
// we need this so that SVG.Doc does not get removed
this.node.firstElementChild || this.remove()
return this
}
})
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