If the lines ${\mathrm{L}}_1$ and ${\mathrm{L}}_2$ are given by 

$\overline{\mathrm{r}} = (\overline{\mathrm{i}} + 2\overline{\mathrm{j}} - \overline{\mathrm{k}})+\mathrm{t}(2\overline{\mathrm{i}} - 3\overline{\mathrm{j}} + \overline{\mathrm{k}})$ and 

$\overline{\mathrm{r}} = (\overline{\mathrm{i}} + \overline{\mathrm{j}} + \overline{\mathrm{k}}) + \mathrm{s}( 2\overline{\mathrm{i}} + \overline{\mathrm{j}} - \overline{\mathrm{k}}),$ then

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