# Shortest distance problem between skew lines

Geometry Level pending

Let $$d$$ denote the shortest distance between the two lines $$l$$ and $$m$$ such that $l: 1-x=y-1=z+1, \quad m:\frac{x-1}{2}=y+1=z-1.$ What is the value of $${d}^{2}?$$

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