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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 18986 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 17355 times.	Basics Training	Start
New	Print every two letters pairs Solved 14167 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 13271 times.	Basics Training	Start
New	Distance Solved 10221 times.	Training	Start
New	Is divisible by ? Solved 5131 times.	Training	Start
New	Check if a number is prime Solved 7480 times.	Training	Start
New	Print every prime numbers in a range Solved 5292 times.	Training	Start
New	Sum of every prime number below n Solved 5333 times.	Training	Start
New	Next prime Solved 4002 times.	Training	Start
New	Display the date and time Solved 5425 times.	Training	Start
New	The Fibonacci sequence Solved 2646 times.	Training	Start
New	Exceptions Solved 2193 times.	Training Command line	Start
New	Flatten lists Solved 1682 times.	Training	Start
New	Print the content of a file Solved 1920 times.	Training	Start
New	Adam Number Solved 1036 times.	Training	Start
New	Product of iterable Solved 2003 times.	Training	Start
New	Frequency of letters in a file Solved 1209 times.	Training	Start
New	Pernicious numbers Solved 1168 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1559 times.	Training	Start
New	Largest product in a series Solved 1052 times.	Training	Start
New	Doing HTTP requests Solved 1015 times.	Training	Start
New	Consecutive Sum Solved 614 times.	Training	Start
New	Longest Collatz sequence Solved 1072 times.	Training	Start
New	Simple adder Solved 1879 times.	Training Command line	Start
New	Lambda expressions Solved 851 times.	Training	Start
New	Largest product in a grid Solved 612 times.	Training	Start
New	Pascal's triangle Solved 460 times.	Training	Start
New	CSV and Python Solved 370 times.	Training	Start