Assertion: rack | /r/CapableOf | incorporate front and rear rails
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Source sentences:
text: Since the spacing between the front and rear mounting posts may differ between rack vendors and/or the configuration of the rack (some racks may incorporate front and rear rails that may be moved forwards and backwards, i.e. APC SX-range racks), it is common for equipment that features 4-post mounting brackets to have an adjustable rear bracket.