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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 16944 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 15450 times.	Basics Training	Start
New	Print every two letters pairs Solved 12569 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 11755 times.	Basics Training	Start
New	Distance Solved 8957 times.	Training	Start
New	Is divisible by ? Solved 3972 times.	Training	Start
New	Check if a number is prime Solved 6483 times.	Training	Start
New	Print every prime numbers in a range Solved 4565 times.	Training	Start
New	Sum of every prime number below n Solved 4669 times.	Training	Start
New	Next prime Solved 3474 times.	Training	Start
New	Display the date and time Solved 4899 times.	Training	Start
New	The Fibonacci sequence Solved 2356 times.	Training	Start
New	Exceptions Solved 2002 times.	Training Command line	Start
New	Flatten lists Solved 1504 times.	Training	Start
New	Print the content of a file Solved 1756 times.	Training	Start
New	Adam Number Solved 849 times.	Training	Start
New	Product of iterable Solved 1816 times.	Training	Start
New	Frequency of letters in a file Solved 1091 times.	Training	Start
New	Pernicious numbers Solved 1051 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1439 times.	Training	Start
New	Largest product in a series Solved 948 times.	Training	Start
New	Doing HTTP requests Solved 931 times.	Training	Start
New	Consecutive Sum Solved 502 times.	Training	Start
New	Longest Collatz sequence Solved 971 times.	Training	Start
New	Simple adder Solved 1804 times.	Training Command line	Start
New	Lambda expressions Solved 786 times.	Training	Start
New	Largest product in a grid Solved 568 times.	Training	Start
New	Pascal's triangle Solved 417 times.	Training	Start
New	CSV and Python Solved 336 times.	Training	Start