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ure 12.6. In (a) s. = O for 4G. Wc can changc s. in iwo ways: (b)if nil thc spccimcn ihrough uigtc t|. <1k tow of tpou move* imkk ihe ere; (c) if wc tiM (he baan ihroufh i\ abovt tfcc łfKCUKS, io the ofipo dircctioo, thc sphcrc moves oulside (be row of spots.
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