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How do I write out: minus I-H-R-D sine D-T equals minus D squared psi D-X squared plus V of X? Critical equipment must have non-critical spares? Planck quantum theory just remain theory why isn t a law ? Bag contains two red marbles six green ones one lavender four yellows and five orange marbles How many sets of five marbles include one each? Indicate the number of unpaired electrons for: [noble gas] ns2np5?