### Brain teasers: Cows and Bulls

The “Cows and Bulls” guessing game is a word or number puzzle game where one player selects a secret code, and the other player tries to guess it.

The “Cows and Bulls” guessing game is a word or number puzzle game where one player selects a secret code, and the other player tries to guess it.

Counting word frequency is a common programming task where we analyze a text document or string to determine how frequently each word appears within it. This exercise is useful for various applications, such as text analysis, natural language processing, and creating word clouds.

Divisors are numbers that divide another number evenly, meaning the division result is a whole number with no remainder.

In the 13th century, there lived an Italian mathematician named Leonardo of Pisa. He studied various mathematical concepts including sequences, which he used to illustrate the growth of a hypothetical population of rabbits. The man was widely known as Fibonacci.

A palindrome is a word, number, phrase, or other sequence of symbols that reads the same backward as forward. The simplest examples of palindromes include madam, racecar, mom, toot, rotor, and many others...