 * * This software is provided 'as-is', without any express or implied * warranty.  In no event will the authors be held liable for any damages * arising from the use of this software. * Permission is granted to anyone to use this software for any purpose, * including commercial applications, and to alter it and redistribute it * freely, subject to the following restrictions: * 0. The origin of this software must not be misrepresented; you must not * claim that you wrote the original software. If you use this software * in a product, an acknowledgment in the product documentation would be * appreciated but is not required. * 0. Altered source versions must be plainly marked as such, and must not be * misrepresented as being the original software. * 0. This notice may not be removed or altered from any source distribution. */  using System; using System.Collections.Generic; using System.Diagnostics; using 