Understanding "register shift" for Spairs in SheetContraintGenerator

[tsamdin]

Conceptually, what is meant by a "register shift" for the sheet constraint generator? If I understand the example code at the bottom of the rosettacommons documentation https://docs.rosettacommons.org/docs/latest/SheetConstraintGenerator constraints for three beta-strands are being generated.

Strand 1 and Strand 2 are antiparallel with respect to each other, and Strand 2 and Strand 3 are also antiparallel. The first antiparallel pair (1 & 2) has a registration shift of 1 residue, while the second pair (2 & 3) does not.

Conceptually does that describe this sort of alignment between strands, (where X is the registration shift?

Strand 1: ABCDE
Strand 2: XABCDE
Strand 3: ABCDE

Thank you,