अव्ययाश्चादयो निपाताः ॥ कZ_०२.१०.१९ ॥
avyayāś cādayo nipātāḥ
助词(nipāta)——如 ca(“和/与”)等——是不变词(avyaya)。
Because connectors and particles govern scope (addition, contrast, condition), which is critical for interpreting rules, exemptions, and multi-step procedures.