If the lines $\overline{\mathrm{r}}=\overline{\mathrm{a}}+\mathrm{\lambda }(\overline{\mathrm{b}}\times \overline{\mathrm{c}})$and $\overline{\mathrm{r}}=\overline{\mathrm{b}}+\mathrm{\mu }(\overline{\mathrm{c}}\times \overline{\mathrm{a}})$ intersect each other then the condition is

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