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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 19043 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 17403 times.	Basics Training	Start
New	Print every two letters pairs Solved 14204 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 13309 times.	Basics Training	Start
New	Distance Solved 10249 times.	Training	Start
New	Is divisible by ? Solved 5154 times.	Training	Start
New	Check if a number is prime Solved 7503 times.	Training	Start
New	Print every prime numbers in a range Solved 5310 times.	Training	Start
New	Sum of every prime number below n Solved 5347 times.	Training	Start
New	Next prime Solved 4016 times.	Training	Start
New	Display the date and time Solved 5441 times.	Training	Start
New	The Fibonacci sequence Solved 2654 times.	Training	Start
New	Exceptions Solved 2200 times.	Training Command line	Start
New	Flatten lists Solved 1686 times.	Training	Start
New	Print the content of a file Solved 1924 times.	Training	Start
New	Adam Number Solved 1038 times.	Training	Start
New	Product of iterable Solved 2006 times.	Training	Start
New	Frequency of letters in a file Solved 1212 times.	Training	Start
New	Pernicious numbers Solved 1170 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1564 times.	Training	Start
New	Largest product in a series Solved 1053 times.	Training	Start
New	Doing HTTP requests Solved 1018 times.	Training	Start
New	Consecutive Sum Solved 619 times.	Training	Start
New	Longest Collatz sequence Solved 1074 times.	Training	Start
New	Simple adder Solved 1883 times.	Training Command line	Start
New	Lambda expressions Solved 856 times.	Training	Start
New	Largest product in a grid Solved 615 times.	Training	Start
New	Pascal's triangle Solved 461 times.	Training	Start
New	CSV and Python Solved 371 times.	Training	Start