sql like not matching code example

Example 1: sql is not like

SELECT * FROM emp
  WHERE name NOT LIKE 'a%'			-- not starting with a
  AND name NOT LIKE '%a'			-- not ending with a
  AND name NOT LIKE '%a%'			-- not containing  a
  AND upper(name) NOT LIKE '%A%'	-- not containing  a or A

Example 2: SQL is not like

SELECT * FROM Student
WHERE FirstName NOT LIKE '%B%'

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