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Heresy.. nudibranch...
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Slow down (hand flat, slowly moving downward)
Hold (clenched fist)
Move up (flat hand makes a sideways "U" shape from bottom to top)
Move down (same in a down direction)
Level off
Question
C'mere (beckoning motion)
That way (flat hand vertical indicating direction)
Turn (index finger vertical and circling)
Boat (cupped hands, often preceded by "Question")