The complete code is: https://paste.ubuntu.com/p/hpWB87kT6P/
The result is: 2> (true,1,diaper,4) 7> (true,3,rubber,2) 4> (true,1,beer,3) 7> (false,3,rubber,2) 7> (true,3,rubber,8) That's the meaning of true/false in the result after running the above code? Thanks for your help~!
