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21.1 | Kissing |
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21.2 | Stroking |
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21.3 | Patting |
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21.4 | Playful shoving |
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21.5 | Wrestling |
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21.6 | Arm wrestling |
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21.7 | Tripping one another during play |
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21.8 | Tickling |
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21.9 | Friendly embrace |
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