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def baloney
  puts "baloney"
end

def bread
  puts "bread"
end

def sandwich(filling)
  bread

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# app/controllers/users/password_controller.rb

class Users::PasswordsController < Devise::PasswordsController
  def resource_params
    params.require(:user).permit(:email, :password, :password_confirmation, :reset_password_token)
  end
  private :resource_params
end

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#!/usr/bin/env sh

brew update
brew install rbenv
brew install ruby-build
brew install openssl
CONFIGURE_OPTS=--with-openssl-dir=`brew --prefix openssl` rbenv install 2.0.0-preview1

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2139   ℹ  INFORMATION SOURCE
23EB   ⏫  BLACK UP-POINTING DOUBLE TRIANGLE
23EC   ⏬  BLACK DOWN-POINTING DOUBLE TRIANGLE
23F0   ⏰  ALARM CLOCK
23F3   ⏳  HOURGLASS WITH FLOWING SAND
26C5   ⛅  SUN BEHIND CLOUD
26D4   ⛔  NO ENTRY
2705   ✅  WHITE HEAVY CHECK MARK
2753   ❓  BLACK QUESTION MARK ORNAMENT
2757   ❗  HEAVY EXCLAMATION MARK SYMBOL

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.highlight  {
  background: white;
}

/* Comment */
.highlight .c {
  color: #988;
  font-style: italic;
}

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From William Thurston: On proof and progress in mathematics
http://arxiv.org/pdf/math/9404236v1.pdf

When a significant theorem is proved, it often (but not always) happens that the solution can be communicated in a matter of minutes from one person to another within the subfield. The same proof would be communicated and generally understood in an hour talk to members of the subfield. It would be the subject of a 15- or 20-page paper, which could be read and understood in a few hours or perhaps days by members of the subfield.

Why is there such a big expansion from the informal discussion to the talk to the paper? One-on-one, people use wide channels of communication that go far beyond formal mathematical language. They use gestures, they draw pictures and diagrams, they make sound effects and use body language. Communication is more likely to be two-way, so that people can concentrate on what needs the most attention. With these channels of communication, they are in a much better position to convey what's 

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                           ___________________________________________________ 
                          |                         |                         |
                          |     YOU FOLLOW THEM     |  YOU DON'T FOLLOW THEM  |
 _________________________|_________________________|_________________________|
|                         |                         |                         |
|     THEY FOLLOW YOU     |         FRIEND          |        FOLLOWER         |
|_________________________|_________________________|_________________________|
|                         |                         |                         |
|  THEY DON'T FOLLOW YOU  |          ???            |          USER           |
|_________________________|_________________________|_________________________|