This problem has been polished along with an enhanced test suite.
Return the largest number that is adjacent to a zero
Implement a ROT13 cipher
Return 'on' or 'off'
Try 1.5.4: Celsius to Fahrenheit
Add two numbers
Find sum of negative elements in row.
Calculate roots of polynomial given as vector array.
Create a square matrix with given conditions
Opposite task convert string hexadecimal numbers array into array of decimal numbers .
Replace x value into y value in string text.
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