char_appears("She sells sea shells by the seashore.", "s") ➞ [1, 2, 1, 2, 0, 0, 2]

char_appears("Peter Piper picked a peck of pickled peppers.", "P") ➞ [1, 2, 1, 0, 1, 0, 1, 3]

char_appears("She hiked in the morning, then swam in the river.", "t") ➞ [0, 0, 0, 1, 0, 1, 0, 0, 1, 0]

self.assertEqual(char_appears("She sells sea shells by the seashore.", "s"), [1, 2, 1, 2, 0, 0, 2])
self.assertEqual(char_appears("Peter Piper picked a peck of pickled peppers.", "P"), [1, 2, 1, 0, 1, 0, 1, 3])
self.assertEqual(char_appears("She hiked in the morning, then swam in the river.", "t"), [0, 0, 0, 1, 0, 1, 0, 0, 1, 0])

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