Tokenizer

Copyright (c) 2017 Arne Blankerts <arne@blankerts.de> and contributors
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.

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  this list of conditions and the following disclaimer in the documentation
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* Neither the name of Arne Blankerts nor the names of contributors
  may be used to endorse or promote products derived from this software
  without specific prior written permission.

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