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distributeHorizontallyCenter(){distributeHorizontally(getLeftPosition,function(a){return getWidth(a)/2})}function distributeHorizontallyRight(){distributeHorizontally(getLeftPosition,getWidth)}function distributeVerticallyTop(){distributeVertically(getTopPosition,function(a){return 0})}function distributeVerticallyMiddle(){distributeVertically(getTopPosition,function(a){return getHeight(a)/2})}function distributeVerticallyBottom(){distributeVertically(getTopPosition,getHeight)};