ProofShift.SV: def of lawful-bytes@0.1.1.0
Import: import lawful-bytes@0.1.1.0/proof_shift.bend as ProofShift
Lines 179-181 of lawful-bytes@0.1.1.0/proof_shift.bend: https://jend.leeeet.dev/read.txt?path=lawful-bytes@0.1.1.0/proof_shift.bend&start_line=179&end_line=181

import Base

# Bytes j onwards are still those of xs; bytes below j are xs from k on.
def SV(+xs: List<&2, U32>, +kk: Nat, +jj: Nat) -> List<&2, U32>:
  List.append(&2, U32, List.take(&2, U32, List.drop(&2, U32, xs, kk), jj), List.drop(&2, U32, xs, jj))

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.append
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.drop
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.take
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32