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The radius of this arc is equal to the diameter of the wound . Without the ballast , the arc is a short circuit between the filaments , and this short circuit contains a lot of current . This arc is approximately 7 " .5 long and 0 " .5 wide , and has a surface brightness ~ 10 times fainter than the central nebula . The letters are written on arcs which rotate when a letter on the arc is clicked . For graphs where each arc is selected at random with probability p , the average time to compute the transitive closure is no greater than min { a1 pn3 + a2n2 , 1/2 a1n2p-2 + a2n2 } for large n .