| moment of area: | along the axis of the maximum principal second moment of area, a representation of Errera’s rule (Errera, 1888), as the axis of the maximum principal second moment of area will point along the shortest axis of the cell, |
| stress: | along the axis of maximal stress, |
| previous plane: | perpendicular to the mother cell’s previous division plane, |
| random: | along a random direction, |
| equal area: | along a random direction that ensures exact splitting into to equal areas. |
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