cheat sheets.

"zip" => "zip(...) => { |...| ... }" 
  "y" => ":yields: arguments (rdoc)" 
  "w" => "attr_writer ..."
  "select" =>  "select { |...| ... }" 
  "rw" =>  "attr_accessor ..."
  "rreq" => "require File.join(File.dirname(__FILE__), ...)"
  "req" => "require \"...\""
  "reject" => "reject { |...| ... }"
  "rb" => "/usr/bin/ruby -wKU"
  "r" => "attr_reader ..."
  "mm" => "def method_missing ... end"
  "inject" => "inject(...) { |...| ... }"
  "ife" => "if ... else ... end"
  "if" => "if ... end" 
  "forin" => "for ... in ...; ... end"
  "eawi" => "each_with_index { |e, i| ... }"
  "eav" => "each_value { |val| ... }"
  "eai" => "each_index { |i| ... }"
  "eac" => "each_cons(...) { |...| ... }"
  "ea" => "each { |...| ... }"
  "det" => "detect { |...| ... }"
  "deli" => "delete_if { |...| ... }"
  "dee" => "deep_copy(...)"
  "collect" => "collect { |...| ... }"
  "cls" => "class ... end" 
  "classify" => "classify { |...| ... }"
  "cla" => "class << self ... end"
  "case" => "case ... end"
  "bm" => "Benchmark.bmbm(...) do ... end"
  "app" => "if __FILE__ == $PROGRAM_NAME ... end" 
  "any" => "any? { |...| ... }"
  "am" => "alias_method new, old"
  "all" => "all? { |...| ... }"
  "Comp" => "include Comparable; def <=> ... end"
  "=b" => "=b"
  "#"  => "# =>"