def parent_cv
import bend-collections@1.0.0.0/src/crypto/blake/blake3/blake3.bend as Blake3import Base
import bend-collections@1.0.0.0/src/crypto/blake/blake3/types.bend as T
import bend-collections@1.0.0.0/src/crypto/blake/blake3/compress.bend as C
151def parent_cv(l: T.CV, r: T.CV) -> T.CV:
152 C.compress(iv(),parent_block(l,r),0,64,4)