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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 14610 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 13276 times.	Basics Training	Start
New	Print every two letters pairs Solved 10667 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 9939 times.	Basics Training	Start
New	Distance Solved 7385 times.	Training	Start
New	Is divisible by ? Solved 2501 times.	Training	Start
New	Check if a number is prime Solved 5243 times.	Training	Start
New	Print every prime numbers in a range Solved 3664 times.	Training	Start
New	Sum of every prime number below n Solved 3877 times.	Training	Start
New	Next prime Solved 2821 times.	Training	Start
New	Display the date and time Solved 4250 times.	Training	Start
New	The Fibonacci sequence Solved 1995 times.	Training	Start
New	Exceptions Solved 1734 times.	Training Command line	Start
New	Flatten lists Solved 1292 times.	Training	Start
New	Print the content of a file Solved 1569 times.	Training	Start
New	Adam Number Solved 625 times.	Training	Start
New	Product of iterable Solved 1591 times.	Training	Start
New	Frequency of letters in a file Solved 971 times.	Training	Start
New	Pernicious numbers Solved 941 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1306 times.	Training	Start
New	Largest product in a series Solved 845 times.	Training	Start
New	Doing HTTP requests Solved 832 times.	Training	Start
New	Consecutive Sum Solved 377 times.	Training	Start
New	Longest Collatz sequence Solved 869 times.	Training	Start
New	Simple adder Solved 1712 times.	Training Command line	Start
New	Lambda expressions Solved 716 times.	Training	Start
New	Largest product in a grid Solved 513 times.	Training	Start
New	Pascal's triangle Solved 377 times.	Training	Start
New	CSV and Python Solved 302 times.	Training	Start