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Those exercises are often focusing on a single aspect of the language:

They should be quick to understand.
But they may not be the kind of problem you'll encounter in real life.

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New	Sum of even numbers <= 100 Solved 14519 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 13180 times.	Basics Training	Start
New	Print every two letters pairs Solved 10580 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 9855 times.	Basics Training	Start
New	Distance Solved 7317 times.	Training	Start
New	Is divisible by ? Solved 2440 times.	Training	Start
New	Check if a number is prime Solved 5197 times.	Training	Start
New	Print every prime numbers in a range Solved 3622 times.	Training	Start
New	Sum of every prime number below n Solved 3839 times.	Training	Start
New	Next prime Solved 2785 times.	Training	Start
New	Display the date and time Solved 4214 times.	Training	Start
New	The Fibonacci sequence Solved 1978 times.	Training	Start
New	Exceptions Solved 1724 times.	Training Command line	Start
New	Flatten lists Solved 1283 times.	Training	Start
New	Print the content of a file Solved 1561 times.	Training	Start
New	Adam Number Solved 616 times.	Training	Start
New	Product of iterable Solved 1585 times.	Training	Start
New	Frequency of letters in a file Solved 963 times.	Training	Start
New	Pernicious numbers Solved 934 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1297 times.	Training	Start
New	Largest product in a series Solved 839 times.	Training	Start
New	Doing HTTP requests Solved 829 times.	Training	Start
New	Consecutive Sum Solved 373 times.	Training	Start
New	Longest Collatz sequence Solved 864 times.	Training	Start
New	Simple adder Solved 1709 times.	Training Command line	Start
New	Lambda expressions Solved 715 times.	Training	Start
New	Largest product in a grid Solved 512 times.	Training	Start
New	Pascal's triangle Solved 377 times.	Training	Start
New	CSV and Python Solved 301 times.	Training	Start