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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 16110 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 14662 times.	Basics Training	Start
New	Print every two letters pairs Solved 11882 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 11099 times.	Basics Training	Start
New	Distance Solved 8404 times.	Training	Start
New	Is divisible by ? Solved 3457 times.	Training	Start
New	Check if a number is prime Solved 6051 times.	Training	Start
New	Print every prime numbers in a range Solved 4243 times.	Training	Start
New	Sum of every prime number below n Solved 4385 times.	Training	Start
New	Next prime Solved 3228 times.	Training	Start
New	Display the date and time Solved 4673 times.	Training	Start
New	The Fibonacci sequence Solved 2221 times.	Training	Start
New	Exceptions Solved 1901 times.	Training Command line	Start
New	Flatten lists Solved 1432 times.	Training	Start
New	Print the content of a file Solved 1693 times.	Training	Start
New	Adam Number Solved 776 times.	Training	Start
New	Product of iterable Solved 1740 times.	Training	Start
New	Frequency of letters in a file Solved 1053 times.	Training	Start
New	Pernicious numbers Solved 1012 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1388 times.	Training	Start
New	Largest product in a series Solved 913 times.	Training	Start
New	Doing HTTP requests Solved 896 times.	Training	Start
New	Consecutive Sum Solved 457 times.	Training	Start
New	Longest Collatz sequence Solved 933 times.	Training	Start
New	Simple adder Solved 1763 times.	Training Command line	Start
New	Lambda expressions Solved 756 times.	Training	Start
New	Largest product in a grid Solved 545 times.	Training	Start
New	Pascal's triangle Solved 398 times.	Training	Start
New	CSV and Python Solved 321 times.	Training	Start