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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 13881 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 12582 times.	Basics Training	Start
New	Print every two letters pairs Solved 10077 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 9372 times.	Basics Training	Start
New	Distance Solved 6918 times.	Training	Start
New	Is divisible by ? Solved 2073 times.	Training	Start
New	Check if a number is prime Solved 4873 times.	Training	Start
New	Print every prime numbers in a range Solved 3380 times.	Training	Start
New	Sum of every prime number below n Solved 3629 times.	Training	Start
New	Next prime Solved 2617 times.	Training	Start
New	Display the date and time Solved 4035 times.	Training	Start
New	The Fibonacci sequence Solved 1869 times.	Training	Start
New	Exceptions Solved 1650 times.	Training Command line	Start
New	Flatten lists Solved 1215 times.	Training	Start
New	Print the content of a file Solved 1501 times.	Training	Start
New	Adam Number Solved 546 times.	Training	Start
New	Product of iterable Solved 1514 times.	Training	Start
New	Frequency of letters in a file Solved 926 times.	Training	Start
New	Pernicious numbers Solved 902 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1263 times.	Training	Start
New	Largest product in a series Solved 804 times.	Training	Start
New	Doing HTTP requests Solved 804 times.	Training	Start
New	Consecutive Sum Solved 332 times.	Training	Start
New	Longest Collatz sequence Solved 826 times.	Training	Start
New	Simple adder Solved 1677 times.	Training Command line	Start
New	Lambda expressions Solved 687 times.	Training	Start
New	Largest product in a grid Solved 490 times.	Training	Start
New	Pascal's triangle Solved 367 times.	Training	Start
New	CSV and Python Solved 290 times.	Training	Start