1.

In a tetragonal unit cell:

Answer»

a = b = c, `ALPHA = BETA = gamma NE 90^(@)`
a = b ne c, `alpha = beta = gamma = 90^(@)`
a = b = c, `alpha = beta = gamma = 90^(@)`
a = b ne c, `alpha = beta = 90^(@), gamma = 120^(@)`

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