sentences:  Oak Ridge Leadership Computing Facility
  
  The Oak Ridge Leadership Computing Facility (OLCF), formerly the National Leadership Computing Facility, is a designated user facility operated by Oak Ridge National Laboratory and the Department of Energy.It contains several supercomputers, the largest of which is an IBM OLCF-4 named Summit, which was ranked 1st on the TOP500 list of world's fastest supercomputers as of June 2018.