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if (this.bookmarkRoot.children! = null) {for (var i = 0؛ i <this.bookmarkRoot.children. length؛ i ++) {var bkm = this.bookmarkRoot.children [i]؛ if (bkm.children! = null) {for (var j = bkm.children.length-1؛ j> = 0؛ j--) {bkm.children [j] .remove ()؛ }}}}