else-if-is-not-elsif.rb

# This...

if x == y and y == z
  puts "This triangle is equilateral"
else
  if x == y or y == z or x == z
    puts "This triangle is isoceles"
  else
    if x != y and y != z and x != z
      puts "this triangle is scalene"
    end
  end
end

# ...is not the same as this...

if x == y and y == z
  puts "This triangle is equilateral"
elsif x == y or y == z or x == z
  puts "This triangle is isoceles"
elsif x != y and y != z and x != z
  puts "this triangle is scalene"
end