Anekarthasamgraha 3.9

3.9

tarko vitarke kāṅkṣāyāmūhakarmaviśeṣayoḥ .
trikā kūpasya nemau syāttrikaṃ pṛṣṭhādhare traye .. 9 ..

*tarka* for doubt, desire, conjecture, and a particular action;
*trikā* may refer to the rim of a well; *trika* to the lower part of the back and a triad;