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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 17699 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 16146 times.	Basics Training	Start
New	Print every two letters pairs Solved 13151 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 12310 times.	Basics Training	Start
New	Distance Solved 9415 times.	Training	Start
New	Is divisible by ? Solved 4408 times.	Training	Start
New	Check if a number is prime Solved 6857 times.	Training	Start
New	Print every prime numbers in a range Solved 4821 times.	Training	Start
New	Sum of every prime number below n Solved 4920 times.	Training	Start
New	Next prime Solved 3676 times.	Training	Start
New	Display the date and time Solved 5097 times.	Training	Start
New	The Fibonacci sequence Solved 2468 times.	Training	Start
New	Exceptions Solved 2081 times.	Training Command line	Start
New	Flatten lists Solved 1575 times.	Training	Start
New	Print the content of a file Solved 1822 times.	Training	Start
New	Adam Number Solved 926 times.	Training	Start
New	Product of iterable Solved 1893 times.	Training	Start
New	Frequency of letters in a file Solved 1135 times.	Training	Start
New	Pernicious numbers Solved 1096 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1485 times.	Training	Start
New	Largest product in a series Solved 986 times.	Training	Start
New	Doing HTTP requests Solved 960 times.	Training	Start
New	Consecutive Sum Solved 540 times.	Training	Start
New	Longest Collatz sequence Solved 1007 times.	Training	Start
New	Simple adder Solved 1828 times.	Training Command line	Start
New	Lambda expressions Solved 810 times.	Training	Start
New	Largest product in a grid Solved 582 times.	Training	Start
New	Pascal's triangle Solved 427 times.	Training	Start
New	CSV and Python Solved 344 times.	Training	Start