package iskra

import "git.smesh.lol/iskradb/lattice"

// BigramKey constructs a 64-bit key for a segment pair.
func BigramKey(stage uint8, prev, next []byte) lattice.Key {
	combined := []byte{:0:len(prev) + 1 + len(next)}
	combined = append(combined, prev...)
	combined = append(combined, '|')
	combined = append(combined, next...)
	return MakeCodeKey(stage, HashBytes(combined))
}