bound ⪢⪢
http://qindex.info/i.php?x=11857
◎◎◎ boundary ⪢⪢
http://qindex.info/i.php?x=13500
○○○ boundary ⪢⪢
http://qindex.info/i.php?x=24691
Google ➔ DictionaryImageYouGlish

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