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apRkta:: ekAl-pratyayaH

अपृक्त‌ एकाल्प्रत्ययः ONPANINI 12041

A one-letter suffix is called an /apRkta.

The /it letters don't count.

As for instance, sUtra halGyAbbhyodIrgh... mentions suffixes /su /tip /sip. Without the /it, those are s स् ti ति si सि. The s स् is always an /apRkta, but the si सि and the ti ति are only /apRkta when their i इ vanishes by, say, itazca.