A certain regular tetrahedron has three of its vertices at the points $(0,1,2),$ $(4,2,1),$ and $(3,1,5).$  Find the coordinates of the fourth vertex, given that they are also all integers.
Question:
A certain regular tetrahedron has three of its vertices at the points $(0,1,2),$ $(4,2,1),$ and $(3,1,5).$  Find the coordinates of the fourth vertex, given that they are also all integers.
Answer:
Let's think step by step.

user
(3,-2,2)
A certain regular tetrahedron has three of its vertices at the points $(0,1,2),$ $(4,2,1),$ and $(3,1,5).$  Find the coordinates of the fourth vertex, given that they are also all integers.
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