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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 15433 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 14053 times.	Basics Training	Start
New	Print every two letters pairs Solved 11349 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 10599 times.	Basics Training	Start
New	Distance Solved 7946 times.	Training	Start
New	Is divisible by ? Solved 3030 times.	Training	Start
New	Check if a number is prime Solved 5671 times.	Training	Start
New	Print every prime numbers in a range Solved 3984 times.	Training	Start
New	Sum of every prime number below n Solved 4156 times.	Training	Start
New	Next prime Solved 3039 times.	Training	Start
New	Display the date and time Solved 4484 times.	Training	Start
New	The Fibonacci sequence Solved 2121 times.	Training	Start
New	Exceptions Solved 1824 times.	Training Command line	Start
New	Flatten lists Solved 1370 times.	Training	Start
New	Print the content of a file Solved 1638 times.	Training	Start
New	Adam Number Solved 708 times.	Training	Start
New	Product of iterable Solved 1679 times.	Training	Start
New	Frequency of letters in a file Solved 1015 times.	Training	Start
New	Pernicious numbers Solved 983 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1355 times.	Training	Start
New	Largest product in a series Solved 887 times.	Training	Start
New	Doing HTTP requests Solved 867 times.	Training	Start
New	Consecutive Sum Solved 423 times.	Training	Start
New	Longest Collatz sequence Solved 910 times.	Training	Start
New	Simple adder Solved 1741 times.	Training Command line	Start
New	Lambda expressions Solved 741 times.	Training	Start
New	Largest product in a grid Solved 530 times.	Training	Start
New	Pascal's triangle Solved 390 times.	Training	Start
New	CSV and Python Solved 312 times.	Training	Start