#! ruby -Ku

print("18..20 is \n")
for num in 18..20 do
  print("num = ", num, "\n")
end

print("18...20 is \n")
for num in 18...20 do
  print("num = ", num, "\n")
end

print("\"Ax\"..\"Bc\" is \n")
for str in "Ax".."Bb" do
  print("str = " + str + "\n")
end