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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 13124 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 11878 times.	Basics Training	Start
New	Print every two letters pairs Solved 9466 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 8780 times.	Basics Training	Start
New	Distance Solved 6402 times.	Training	Start
New	Is divisible by ? Solved 1552 times.	Training	Start
New	Check if a number is prime Solved 4469 times.	Training	Start
New	Print every prime numbers in a range Solved 3099 times.	Training	Start
New	Sum of every prime number below n Solved 3371 times.	Training	Start
New	Next prime Solved 2413 times.	Training	Start
New	Display the date and time Solved 3809 times.	Training	Start
New	The Fibonacci sequence Solved 1757 times.	Training	Start
New	Exceptions Solved 1577 times.	Training Command line	Start
New	Flatten lists Solved 1150 times.	Training	Start
New	Print the content of a file Solved 1445 times.	Training	Start
New	Adam Number Solved 479 times.	Training	Start
New	Product of iterable Solved 1445 times.	Training	Start
New	Frequency of letters in a file Solved 880 times.	Training	Start
New	Pernicious numbers Solved 859 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1221 times.	Training	Start
New	Largest product in a series Solved 763 times.	Training	Start
New	Doing HTTP requests Solved 768 times.	Training	Start
New	Longest Collatz sequence Solved 781 times.	Training	Start
New	Simple adder Solved 1645 times.	Training Command line	Start
New	Consecutive Sum Solved 279 times.	Training	Start
New	Lambda expressions Solved 660 times.	Training	Start
New	Largest product in a grid Solved 468 times.	Training	Start
New	Pascal's triangle Solved 353 times.	Training	Start
New	CSV and Python Solved 278 times.	Training	Start