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In a certain workstation $(1/3)$ of the workers are women, $(1/2)$ of the women are married and $(1/3)$ of the married women have children. If $(2/3)$ of the men are married and $(1/2)$ of the married men have children, what part of workers is without children?

1. $\frac{15}{18}$
2. $\frac{13}{18}$
3. $\frac{11}{18}$
4. $\frac{5}{18}$

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