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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 15643 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 14249 times.	Basics Training	Start
New	Print every two letters pairs Solved 11513 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 10754 times.	Basics Training	Start
New	Distance Solved 8107 times.	Training	Start
New	Is divisible by ? Solved 3178 times.	Training	Start
New	Check if a number is prime Solved 5806 times.	Training	Start
New	Print every prime numbers in a range Solved 4070 times.	Training	Start
New	Sum of every prime number below n Solved 4227 times.	Training	Start
New	Next prime Solved 3101 times.	Training	Start
New	Display the date and time Solved 4539 times.	Training	Start
New	The Fibonacci sequence Solved 2154 times.	Training	Start
New	Exceptions Solved 1850 times.	Training Command line	Start
New	Flatten lists Solved 1391 times.	Training	Start
New	Print the content of a file Solved 1655 times.	Training	Start
New	Adam Number Solved 728 times.	Training	Start
New	Product of iterable Solved 1700 times.	Training	Start
New	Frequency of letters in a file Solved 1025 times.	Training	Start
New	Pernicious numbers Solved 994 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1366 times.	Training	Start
New	Largest product in a series Solved 896 times.	Training	Start
New	Doing HTTP requests Solved 875 times.	Training	Start
New	Consecutive Sum Solved 435 times.	Training	Start
New	Longest Collatz sequence Solved 921 times.	Training	Start
New	Simple adder Solved 1747 times.	Training Command line	Start
New	Lambda expressions Solved 746 times.	Training	Start
New	Largest product in a grid Solved 533 times.	Training	Start
New	Pascal's triangle Solved 393 times.	Training	Start
New	CSV and Python Solved 316 times.	Training	Start