Left: ten 十, right: var. of wholly, exclusively 専 (The soil 一 is penetrated by a (single) sprout 丨 in the rice field 田, cared for by a skillful hand 寸, which is exclusive.)
Mnemonic
(Gratitude of the patients:) Tenfold is the whole gain of a doctor.
Image of a hand 一 forearm 丨 and pulse 丶. It was originally also the distance of one inch (Length: 1 SUN = 3.03 cm) from the hand's palm to the pulse. This also stood for a small amount. The mnemonics use it as "skillful hand" and partly as "to measure".
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