Mandeleev's periodic table| Newlands law of octaves | Doberniers's triads| MERITS AND DEMERITS
Mandeleev's periodic table| Newlands law of octaves | Doberniers's triads| MERITS AND DEMERITS
Mandeleev's periodic table| Newlands law of octaves | Doberniers's triads| MERITS AND DEMERITS
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