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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 16871 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 15380 times.	Basics Training	Start
New	Print every two letters pairs Solved 12509 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 11698 times.	Basics Training	Start
New	Distance Solved 8910 times.	Training	Start
New	Is divisible by ? Solved 3929 times.	Training	Start
New	Check if a number is prime Solved 6440 times.	Training	Start
New	Print every prime numbers in a range Solved 4530 times.	Training	Start
New	Sum of every prime number below n Solved 4640 times.	Training	Start
New	Next prime Solved 3449 times.	Training	Start
New	Display the date and time Solved 4871 times.	Training	Start
New	The Fibonacci sequence Solved 2339 times.	Training	Start
New	Exceptions Solved 1991 times.	Training Command line	Start
New	Flatten lists Solved 1498 times.	Training	Start
New	Print the content of a file Solved 1748 times.	Training	Start
New	Adam Number Solved 842 times.	Training	Start
New	Product of iterable Solved 1808 times.	Training	Start
New	Frequency of letters in a file Solved 1087 times.	Training	Start
New	Pernicious numbers Solved 1048 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1435 times.	Training	Start
New	Largest product in a series Solved 942 times.	Training	Start
New	Doing HTTP requests Solved 925 times.	Training	Start
New	Consecutive Sum Solved 497 times.	Training	Start
New	Longest Collatz sequence Solved 966 times.	Training	Start
New	Simple adder Solved 1797 times.	Training Command line	Start
New	Lambda expressions Solved 783 times.	Training	Start
New	Largest product in a grid Solved 565 times.	Training	Start
New	Pascal's triangle Solved 414 times.	Training	Start
New	CSV and Python Solved 334 times.	Training	Start