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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 16966 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 15473 times.	Basics Training	Start
New	Print every two letters pairs Solved 12593 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 11776 times.	Basics Training	Start
New	Distance Solved 8973 times.	Training	Start
New	Is divisible by ? Solved 3988 times.	Training	Start
New	Check if a number is prime Solved 6497 times.	Training	Start
New	Print every prime numbers in a range Solved 4576 times.	Training	Start
New	Sum of every prime number below n Solved 4680 times.	Training	Start
New	Next prime Solved 3481 times.	Training	Start
New	Display the date and time Solved 4905 times.	Training	Start
New	The Fibonacci sequence Solved 2363 times.	Training	Start
New	Exceptions Solved 2007 times.	Training Command line	Start
New	Flatten lists Solved 1506 times.	Training	Start
New	Print the content of a file Solved 1757 times.	Training	Start
New	Adam Number Solved 853 times.	Training	Start
New	Product of iterable Solved 1819 times.	Training	Start
New	Frequency of letters in a file Solved 1091 times.	Training	Start
New	Pernicious numbers Solved 1053 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1441 times.	Training	Start
New	Largest product in a series Solved 948 times.	Training	Start
New	Doing HTTP requests Solved 933 times.	Training	Start
New	Consecutive Sum Solved 504 times.	Training	Start
New	Longest Collatz sequence Solved 973 times.	Training	Start
New	Simple adder Solved 1805 times.	Training Command line	Start
New	Lambda expressions Solved 788 times.	Training	Start
New	Largest product in a grid Solved 568 times.	Training	Start
New	Pascal's triangle Solved 418 times.	Training	Start
New	CSV and Python Solved 336 times.	Training	Start