משנה על כלאים 9:11

[The shell of] a roasted egg [is considered connected] until it is cracked. That of a hard-boiled egg [is considered connected] until it is entirely broken up. A marrow-bone serves as connected until it is wholly crushed. A pomegranate that has been divided into sections is connected until it has been knocked with a stick. Similarly, loose stitches of laundrymen or a garment that had been stitched together with threads of kilayim, are connected until one begins to loosen them.