करदस्य वाकरदग्रामं प्रविशतः ॥ कZ_०३.१०.११ ॥
karadasya vākaradagrāmaṃ praviśataḥ
करद (या अकरद) के अकरद-ग्राम में प्रवेश करने के मामले में…
It functions as a legal hinge: it sets the condition ('when X enters Y') and is completed by the operative rule in the next sutra.