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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 12062 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 10907 times.	Basics Training	Start
New	Print every two letters pairs Solved 8642 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 8003 times.	Basics Training	Start
New	Distance Solved 5754 times.	Training	Start
New	Check if a number is prime Solved 3928 times.	Training	Start
New	Print every prime numbers in a range Solved 2696 times.	Training	Start
New	Sum of every prime number below n Solved 3028 times.	Training	Start
New	Next prime Solved 2144 times.	Training	Start
New	Display the date and time Solved 3571 times.	Training	Start
New	The Fibonacci sequence Solved 1611 times.	Training	Start
New	Flatten lists Solved 1053 times.	Training	Start
New	Exceptions Solved 1474 times.	Training	Start
New	Print the content of a file Solved 1353 times.	Training	Start
New	Is divisible by ? Solved 1412 times.	Training	Start
New	Adam Number Solved 369 times.	Training	Start
New	Product of iterable Solved 1339 times.	Training	Start
New	Frequency of letters in a file Solved 824 times.	Training	Start
New	Pernicious numbers Solved 807 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1157 times.	Training	Start
New	Largest product in a series Solved 705 times.	Training	Start
New	Doing HTTP requests Solved 732 times.	Training	Start
New	Longest Collatz sequence Solved 714 times.	Training	Start
New	Simple adder Solved 1604 times.	Training Command line	Start
New	Consecutive Sum Solved 238 times.	Training	Start
New	Lambda expressions Solved 623 times.	Training	Start
New	Largest product in a grid Solved 435 times.	Training	Start
New	Pascal's triangle Solved 330 times.	Training	Start
New	CSV and Python Solved 270 times.	Training	Start