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def mask(x)y=x.dup;y[6...-4]=y[6...-4].gsub(/./,'*');y end

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require 'set'

def distinct_sets(setlist)
  Set.new( setlist.map{|s|Set.new(s)} ).
    divide {|a,b| ! (a&b).empty? }.to_a.
    map{|e|e.to_a.inject{|b,l|b|l}.to_a.sort{|a,b| if Numeric === a && Numeric === b
                                                     a <=> b
                                                   else
                                                     a.to_s <=> b.to_s
                                                   end }}

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cons   () { if [ -e Gemfile ]; then
                be='bundle exec'
            else
                be=""
            fi
            if [ -x "script/console" ]; then
                ${be} ruby script/console ${1:-${RAILS_ENV:-development}}
            else
                ${be} rails console ${1:-${RAILS_ENV:-development}}
            fi

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# COMMUNITY CHALLENGE
#
# How would you test this Quiz#problem method? Only two rules:
#
# 1. The tests should fail if any part of the application breaks.
#    For example: If "gets" is moved before "puts" then the tests should
#    fail since that breaks the application.
#
# 2. You cannot change the Quiz class. But you can use whatever framework
#    and tools you want for the tests. (RSpec, Cucumber, etc.)

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# image_size.rb
#
# Copyright (c) 2007 Rob Biedenharn
#   Rob [at] AgileConsultingLLC.com
#   Rob_Biedenharn [at] alum.mit.edu
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

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#!/usr/bin/env ruby -w
#
# Copyright (c) 2008 Rob Biedenharn
#   Rob [at] AgileConsultingLLC.com
#   Rob_Biedenharn [at] alum.mit.edu
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or