◎◎◎ ceremony ⪢⪢
A ceremony is an event that happens on special occasions.
http://qindex.info/i.php?x=13113

○○○ occasional ⪢⪢
For Gibbons the _____ fall is part of life. The important thing is to catch another branch and keep on swinging.
http://qindex.info/i.php?x=14965

○○○ on occasion ⪢⪢
http://qindex.info/i.php?x=19776

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