work on Intro; import code from previous parts where appropriate
authorRalf Jung <post@ralfj.de>
Sat, 13 Jun 2015 11:58:20 +0000 (13:58 +0200)
committerRalf Jung <post@ralfj.de>
Sat, 13 Jun 2015 11:58:20 +0000 (13:58 +0200)

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