F remove_comments(line, sep)
   V? p = line.find(sep)
   I p != N
      R line[0.<p].rtrim(‘ ’)
   R line

print(remove_comments(‘apples ; pears # and bananas’, (‘;’, ‘#’)))
print(remove_comments(‘apples ; pears # and bananas’, ‘#’))
print(remove_comments(‘apples ; pears # and bananas’, ‘!’))