live vs alive

live_vs_alive.rb

words = File.read('/usr/share/dict/words').lines.to_a.map(&:chomp); 
a_words = words.select{|i| i =~ /^a.*/}; 
a_sub_words = words.select{|i| a_words.any?{|j| j[i]}}; 
a_sub_words.length
a_sub_words -= a_words
ad_words = a_sub_words.select{|i| a_words.include?("a#{i}")}; ad_words.length




def pretty(a); 
cols=a.sort_by(&:length).group_by(&:length).to_a.sort.map(&:last); 
tot=cols.max{|i| i.length}.length; 
cols.each do |j| 
 j[tot]=nil; 
end; 
cols.first.zip(*cols[1..-1]).map{|k| k.join(' ')}.join("\n"); 
end
 pretty(ad_words).split(' ')