There is an interesting GRA on לבני הפלגשם where Rashi says that a yud is missing and a pilegesh has no kesuvah. What is the connection? איש, אשה and כתובה Hashem י-ה-ו-ה resides in it. The yud in ish, the heh in ishah and the vov heh in kesuvah where it should have been called כתב. The pilegesh has no kesuvah so the vov heh is missing by halfing the shem as פלג שם.
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