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function Timeline (tweens) {
this.tweens = tweens
this.index = 0
}
Timeline.prototype.advance = function(){
var tl = this.tweens[this.index % this.tweens.length]
if (tl.index == -1) {
tl.reset()
tl.index = 0
requestAnimationFrame(this.advance.bind(this))
}
else if (tl.index < tl.timeline.length){
tl.timeline[ tl.index ](this.advance.bind(this))
tl.index += 1
}
else {
this.index += 1
tl.index = -1
requestAnimationFrame(this.advance.bind(this))
}
}
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