Research Articles
by number of atoms

2 atoms

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3 atoms

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4 atoms

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5 atoms

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6 atoms

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7 atoms

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8 atoms

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9 atoms

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10 atoms

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11 atoms

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12 atoms

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13 atoms

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14 atoms

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15 atoms

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16 atoms

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17 atoms

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18 atoms

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19 atoms

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20 atoms

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22 atoms

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23 atoms

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34 atoms

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