The ewpm command is used to enable characters to be generated at a fast rate, whilst increasing the space between characters to make it easier to receive those characters (often known as the Farnsworth Technique). It is an alias of the effective_wpm command.
For a very thorough explanation of Farnsworth Timing check out A Standard for Morse Timing Using the Farnsworth Technique (pdf) by Jon Bloom, courtesy of The Americal Radio Relay League.
require "cw"
cw do
wpm 25
ewpm 12
word_count 4
end