Takes an input array and pairs each element with another from the array. Elements cannot be paired with themselves.

Array_Pair_Generator.rb

a = %w[A B C D E F G H]
a.shuffle!.zip(a.rotate).sort.each { |k,v| puts "#{k}=>#{v}" }

# example return value:
# A=>E
# B=>D
# C=>A
# D=>H
# E=>B
# F=>C
# G=>F
# H=>G