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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 17813 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 16256 times.	Basics Training	Start
New	Print every two letters pairs Solved 13256 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 12402 times.	Basics Training	Start
New	Distance Solved 9490 times.	Training	Start
New	Is divisible by ? Solved 4476 times.	Training	Start
New	Check if a number is prime Solved 6914 times.	Training	Start
New	Print every prime numbers in a range Solved 4864 times.	Training	Start
New	Sum of every prime number below n Solved 4960 times.	Training	Start
New	Next prime Solved 3705 times.	Training	Start
New	Display the date and time Solved 5124 times.	Training	Start
New	The Fibonacci sequence Solved 2482 times.	Training	Start
New	Exceptions Solved 2085 times.	Training Command line	Start
New	Flatten lists Solved 1582 times.	Training	Start
New	Print the content of a file Solved 1827 times.	Training	Start
New	Adam Number Solved 932 times.	Training	Start
New	Product of iterable Solved 1900 times.	Training	Start
New	Frequency of letters in a file Solved 1138 times.	Training	Start
New	Pernicious numbers Solved 1100 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1488 times.	Training	Start
New	Largest product in a series Solved 989 times.	Training	Start
New	Doing HTTP requests Solved 964 times.	Training	Start
New	Consecutive Sum Solved 547 times.	Training	Start
New	Longest Collatz sequence Solved 1012 times.	Training	Start
New	Simple adder Solved 1831 times.	Training Command line	Start
New	Lambda expressions Solved 813 times.	Training	Start
New	Largest product in a grid Solved 583 times.	Training	Start
New	Pascal's triangle Solved 429 times.	Training	Start
New	CSV and Python Solved 346 times.	Training	Start