Dictation

A total of 30 students wrote the dictation. One third of them received a grade of 1 or 4. There were four times as many 2 s as 3 s. How many students received an insufficient grade, given that 7 students received a grade of 1, which is also equal to the sum of those who received a 3 and a 4? Write down the number of students for each grade from 1 to 5.

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