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0.54 inch. 7 0.52 inch. 8 0.49 inch. 9 0.40 inch. 10 0.20 inch. 5 0.25 inch. 6 0.27 inch. 7 0.44 inch. 11 0.16.

Impossible through the dark lines of force of electricity--all of which slaty cleavage forms.