This 1x4x5 has a 1x3x3 within.
1 x 4 x 6 (7)
1 x 4 x 7 (13)
This 1x4x7 has a 1x4x4 and a 1x3x4.
1 x 4 x 8 (61)
And of course the 1x4x8 can be done with the two 1x4x4's.
This animation shows a fully interlocking 1x4x8
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