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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 12690 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 11481 times.	Basics Training	Start
New	Print every two letters pairs Solved 9141 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 8483 times.	Basics Training	Start
New	Distance Solved 6151 times.	Training	Start
New	Check if a number is prime Solved 4265 times.	Training	Start
New	Print every prime numbers in a range Solved 2940 times.	Training	Start
New	Sum of every prime number below n Solved 3235 times.	Training	Start
New	Next prime Solved 2312 times.	Training	Start
New	Display the date and time Solved 3710 times.	Training	Start
New	The Fibonacci sequence Solved 1698 times.	Training	Start
New	Flatten lists Solved 1111 times.	Training	Start
New	Exceptions Solved 1542 times.	Training	Start
New	Print the content of a file Solved 1414 times.	Training	Start
New	Is divisible by ? Solved 1492 times.	Training	Start
New	Adam Number Solved 435 times.	Training	Start
New	Product of iterable Solved 1404 times.	Training	Start
New	Frequency of letters in a file Solved 857 times.	Training	Start
New	Pernicious numbers Solved 837 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1195 times.	Training	Start
New	Largest product in a series Solved 740 times.	Training	Start
New	Doing HTTP requests Solved 757 times.	Training	Start
New	Longest Collatz sequence Solved 754 times.	Training	Start
New	Simple adder Solved 1630 times.	Training Command line	Start
New	Consecutive Sum Solved 259 times.	Training	Start
New	Lambda expressions Solved 647 times.	Training	Start
New	Largest product in a grid Solved 453 times.	Training	Start
New	Pascal's triangle Solved 345 times.	Training	Start
New	CSV and Python Solved 276 times.	Training	Start