Chacha8rand.subtract: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/spec/math/random/chacha8rand.bend as Chacha8rand
Lines 122-125 of bend-collections-laws-crypto@1.0.0.0/spec/math/random/chacha8rand.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/math/random/chacha8rand.bend&start_line=122&end_line=125

import Base

# C2SP: for each block, subtract the constants from words 0..3 and the block
# counter from word 12
def subtract(+b: List<&2, U32>, +i: U32) -> List<&2, U32>:
  sub_at(sub_at(sub_at(sub_at(sub_at(b, 0n, 1634760805), 1n, 857760878), 2n, 2036477234), 3n, 1797285236), 12n, i)

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/math/random/chacha8rand.bend&name=sub_at