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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 19320 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 17674 times.	Basics Training	Start
New	Print every two letters pairs Solved 14431 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 13529 times.	Basics Training	Start
New	Distance Solved 10419 times.	Training	Start
New	Is divisible by ? Solved 5301 times.	Training	Start
New	Check if a number is prime Solved 7618 times.	Training	Start
New	Print every prime numbers in a range Solved 5386 times.	Training	Start
New	Sum of every prime number below n Solved 5416 times.	Training	Start
New	Next prime Solved 4077 times.	Training	Start
New	Display the date and time Solved 5510 times.	Training	Start
New	The Fibonacci sequence Solved 2701 times.	Training	Start
New	Exceptions Solved 2236 times.	Training Command line	Start
New	Flatten lists Solved 1712 times.	Training	Start
New	Print the content of a file Solved 1949 times.	Training	Start
New	Adam Number Solved 1068 times.	Training	Start
New	Product of iterable Solved 2036 times.	Training	Start
New	Frequency of letters in a file Solved 1229 times.	Training	Start
New	Pernicious numbers Solved 1187 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1583 times.	Training	Start
New	Largest product in a series Solved 1070 times.	Training	Start
New	Doing HTTP requests Solved 1031 times.	Training	Start
New	Consecutive Sum Solved 635 times.	Training	Start
New	Longest Collatz sequence Solved 1091 times.	Training	Start
New	Simple adder Solved 1894 times.	Training Command line	Start
New	Lambda expressions Solved 867 times.	Training	Start
New	Largest product in a grid Solved 624 times.	Training	Start
New	Pascal's triangle Solved 468 times.	Training	Start
New	CSV and Python Solved 380 times.	Training	Start