. _:b1 . . _:b2 _:b3 . _:b4 "apple" . _:b4 _:b5 . _:b5 "banana" . _:b5 _:b6 . _:b6 "pear" . _:b6 . _:b4 . _:b7 _:b8 . _:b8 . _:b8 _:b9 . _:b9 . _:b9 . _:b7 _:b10 . _:b10 _:b11 . _:b11 . _:b11 _:b12 . _:b12 . _:b12 . _:b10 . _:b7 . _:b13 _:b14 . _:b14 "apple" . _:b14 _:b15 . _:b15 "banana" . _:b15 _:b16 . _:b16 "pear" . _:b16 . _:b17 . _:b17 . _:b17 . _:b18 _:b19 . _:b19 . _:b19 . _:b18 _:b20 . _:b20 . _:b21 _:b22 . _:b22 _:b23 . _:b23 . _:b22 _:b24 . _:b24 _:b25 . _:b25 . _:b24 .