Can someone help me to find the bugs. Thank you

// This application reads student typing test data // including number of errors on the test, and the number // of words typed per minute. Grades are assigned based // on the following table: // Errors // Speed 0 1 2 or more // 030 C D F // 3150 C C F // 5180 B C D // 81100 A B C // 101 and up A A B start Declarations num MAX_ERRORS = 2 num errors num wordsPerMinute num grades[5][3] = {"C", "D", "F"}, {"C", "C", "F"}, {"B", "C", "D"}, {"A", "B", "C"}, {"A", "A", "B"} num LIMITS = 5 num speedLimits[LIMITS] = 0, 31, 51, 81, 101 num row output "Enter number of errors on the test " input errors if errors > MAX_ERRORS then errors = 0 endif output "Enter the speed in words per minute " input speed row = 0 while row < LIMITS AND wordsPerMinute >= speedLimits[errors] row = row + 1 endwhile row = row - 1 output "Your grade is ", grades[wordsPerMinute][row] stop