Someone is not ready
Someone is ready
User ids are: 1, 2, 3, 4, 5, 6
2 users are younger than 25
These users are younger than 25:
    John - 15 y.o.
    Norah - 20 y.o.
Users sorted by name:
    Bob
    Jack
    John
    Michael
    Norah
    Sarah
Users indexed by id:
    1. John
    2. Jack
    3. Sarah
    4. Norah
    5. Michael
    6. Bob
Users age:
    John is 15 y.o.
    Jack is 35 y.o.
    Sarah is 25 y.o.
    Norah is 20 y.o.
    Michael is 30 y.o.
    Bob is 30 y.o.
Users with unique age:
    John is 15 y.o.
    Jack is 35 y.o.
    Sarah is 25 y.o.
    Norah is 20 y.o.
    Bob is 30 y.o.
Users by age range:
    10-19: John
    20-29: Sarah, Norah
    30-39: Jack, Michael, Bob
Numbers less than 20 which are divisible by 3: 3, 6, 9, 12, 15, 18
New pets rating:
    dog
    cat
    hamster
Jack's age is: 35