Chacha8rand.group: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/spec/math/random/chacha8rand.bend as Chacha8rand
Lines 139-141 of bend-collections-laws-math@1.0.0.0/spec/math/random/chacha8rand.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/spec/math/random/chacha8rand.bend&start_line=139&end_line=141

import Base

# the blocks g, g + 1, g + 2, g + 3, permuted
def group(+key: List<&2, U32>, +g: U32) -> List<&2, U32>:
  interleave(16n, 0n, c2sp_block(key, g), c2sp_block(key, U32.add(g, 1)), c2sp_block(key, U32.add(g, 2)), c2sp_block(key, U32.add(g, 3)))

Uses (5):
  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=Base/base.bend&name=U32.add
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/spec/math/random/chacha8rand.bend&name=c2sp_block
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/spec/math/random/chacha8rand.bend&name=interleave