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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 17424 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 15905 times.	Basics Training	Start
New	Print every two letters pairs Solved 12962 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 12126 times.	Basics Training	Start
New	Distance Solved 9267 times.	Training	Start
New	Is divisible by ? Solved 4267 times.	Training	Start
New	Check if a number is prime Solved 6731 times.	Training	Start
New	Print every prime numbers in a range Solved 4737 times.	Training	Start
New	Sum of every prime number below n Solved 4841 times.	Training	Start
New	Next prime Solved 3610 times.	Training	Start
New	Display the date and time Solved 5033 times.	Training	Start
New	The Fibonacci sequence Solved 2431 times.	Training	Start
New	Exceptions Solved 2053 times.	Training Command line	Start
New	Flatten lists Solved 1547 times.	Training	Start
New	Print the content of a file Solved 1796 times.	Training	Start
New	Adam Number Solved 895 times.	Training	Start
New	Product of iterable Solved 1863 times.	Training	Start
New	Frequency of letters in a file Solved 1118 times.	Training	Start
New	Pernicious numbers Solved 1080 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1468 times.	Training	Start
New	Largest product in a series Solved 974 times.	Training	Start
New	Doing HTTP requests Solved 950 times.	Training	Start
New	Consecutive Sum Solved 530 times.	Training	Start
New	Longest Collatz sequence Solved 997 times.	Training	Start
New	Simple adder Solved 1818 times.	Training Command line	Start
New	Lambda expressions Solved 799 times.	Training	Start
New	Largest product in a grid Solved 576 times.	Training	Start
New	Pascal's triangle Solved 422 times.	Training	Start
New	CSV and Python Solved 341 times.	Training	Start