3DES Mask Attack

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I need help finding a mask for my key


3DES KEY
5CE21B8AF31407B031CD382DB1C098CC

K1
5CE21B8AF31407B0

K2
31CD382DB1C098CC

K3 = K1

5CE21B8AF31407B0

K1 K2 K3
5CE21B8AF31407B031CD382DB1C098CC5CE21B8AF31407B0

how do i put the mask for k1 to be equal to k3, so i would have to find only k1 and k2