040000 tree 9b9d60523de62637d4355b626d2337ff69de3c20	arithmetic
040000 tree fb074384c593366396b9ad936a186eb335836e43	comparison_operators
040000 tree 3ed4d7cfb04c20945c261cec1055fd25c4cb5245	cons
040000 tree 81674998f11df0ddff795642b0dc50b94e28def5	requirements