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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 18795 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 17178 times.	Basics Training	Start
New	Print every two letters pairs Solved 14014 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 13125 times.	Basics Training	Start
New	Distance Solved 10104 times.	Training	Start
New	Is divisible by ? Solved 5016 times.	Training	Start
New	Check if a number is prime Solved 7373 times.	Training	Start
New	Print every prime numbers in a range Solved 5222 times.	Training	Start
New	Sum of every prime number below n Solved 5273 times.	Training	Start
New	Next prime Solved 3956 times.	Training	Start
New	Display the date and time Solved 5373 times.	Training	Start
New	The Fibonacci sequence Solved 2618 times.	Training	Start
New	Exceptions Solved 2171 times.	Training Command line	Start
New	Flatten lists Solved 1663 times.	Training	Start
New	Print the content of a file Solved 1898 times.	Training	Start
New	Adam Number Solved 1015 times.	Training	Start
New	Product of iterable Solved 1982 times.	Training	Start
New	Frequency of letters in a file Solved 1191 times.	Training	Start
New	Pernicious numbers Solved 1152 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1541 times.	Training	Start
New	Largest product in a series Solved 1040 times.	Training	Start
New	Doing HTTP requests Solved 1003 times.	Training	Start
New	Consecutive Sum Solved 602 times.	Training	Start
New	Longest Collatz sequence Solved 1061 times.	Training	Start
New	Simple adder Solved 1865 times.	Training Command line	Start
New	Lambda expressions Solved 841 times.	Training	Start
New	Largest product in a grid Solved 606 times.	Training	Start
New	Pascal's triangle Solved 455 times.	Training	Start
New	CSV and Python Solved 365 times.	Training	Start