Organ improvisation on #42 molybdenum (periodic system by mendeljev)
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Organ improvisation on #39 yttrium (periodic system by mendeljev)
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Organ improvisation on #45 rhodium (periodic system by mendeljev)
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Organ improvisation on #43 technetium (periodic system by mendeljev)
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Organ improvisation on #40 zirconium (periodic system by mendeljev)
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Organ improvisation on #41 niobium (periodic system by mendeljev)
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