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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 17186 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 15683 times.	Basics Training	Start
New	Print every two letters pairs Solved 12773 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 11947 times.	Basics Training	Start
New	Distance Solved 9106 times.	Training	Start
New	Is divisible by ? Solved 4119 times.	Training	Start
New	Check if a number is prime Solved 6603 times.	Training	Start
New	Print every prime numbers in a range Solved 4649 times.	Training	Start
New	Sum of every prime number below n Solved 4756 times.	Training	Start
New	Next prime Solved 3540 times.	Training	Start
New	Display the date and time Solved 4962 times.	Training	Start
New	The Fibonacci sequence Solved 2397 times.	Training	Start
New	Exceptions Solved 2030 times.	Training Command line	Start
New	Flatten lists Solved 1528 times.	Training	Start
New	Print the content of a file Solved 1779 times.	Training	Start
New	Adam Number Solved 877 times.	Training	Start
New	Product of iterable Solved 1843 times.	Training	Start
New	Frequency of letters in a file Solved 1107 times.	Training	Start
New	Pernicious numbers Solved 1069 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1455 times.	Training	Start
New	Largest product in a series Solved 962 times.	Training	Start
New	Doing HTTP requests Solved 939 times.	Training	Start
New	Consecutive Sum Solved 521 times.	Training	Start
New	Longest Collatz sequence Solved 988 times.	Training	Start
New	Simple adder Solved 1813 times.	Training Command line	Start
New	Lambda expressions Solved 795 times.	Training	Start
New	Largest product in a grid Solved 571 times.	Training	Start
New	Pascal's triangle Solved 419 times.	Training	Start
New	CSV and Python Solved 337 times.	Training	Start