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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 18410 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 16820 times.	Basics Training	Start
New	Print every two letters pairs Solved 13722 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 12847 times.	Basics Training	Start
New	Distance Solved 9867 times.	Training	Start
New	Is divisible by ? Solved 4791 times.	Training	Start
New	Check if a number is prime Solved 7180 times.	Training	Start
New	Print every prime numbers in a range Solved 5074 times.	Training	Start
New	Sum of every prime number below n Solved 5135 times.	Training	Start
New	Next prime Solved 3841 times.	Training	Start
New	Display the date and time Solved 5265 times.	Training	Start
New	The Fibonacci sequence Solved 2563 times.	Training	Start
New	Exceptions Solved 2131 times.	Training Command line	Start
New	Flatten lists Solved 1625 times.	Training	Start
New	Print the content of a file Solved 1868 times.	Training	Start
New	Adam Number Solved 978 times.	Training	Start
New	Product of iterable Solved 1945 times.	Training	Start
New	Frequency of letters in a file Solved 1167 times.	Training	Start
New	Pernicious numbers Solved 1128 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1516 times.	Training	Start
New	Largest product in a series Solved 1017 times.	Training	Start
New	Doing HTTP requests Solved 988 times.	Training	Start
New	Consecutive Sum Solved 583 times.	Training	Start
New	Longest Collatz sequence Solved 1044 times.	Training	Start
New	Simple adder Solved 1852 times.	Training Command line	Start
New	Lambda expressions Solved 827 times.	Training	Start
New	Largest product in a grid Solved 595 times.	Training	Start
New	Pascal's triangle Solved 446 times.	Training	Start
New	CSV and Python Solved 358 times.	Training	Start