What does it mean if there is a deep surface in between both palms

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When you look closely at your palms, there are lots of little lines. What causes these? - Quora

What is the meaning of mystic X lines in palmistry? - Quora

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Modern surgery, general and operative. xof the index and the middle finger (Gowers). The sensory changes aftermedian paralysis are quite variable—sometimes widespread and complete,at other times trivial, and occasionally absent. Gowers

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What is the meaning of mystic X lines in palmistry? - Quora

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I have a straight horizontal line stretching across both my palms (left to right). What does it mean? - Quora