Sūtra 2·4·32
इदमो ऽन्वादेशे ऽश् अनुदात्तस् तृतीयादौ
idamo 'nvādeśe 'ś anudāttas tṛtīyādau
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In the room of idam ‘this’ in case of its re-employment in a subsequent member of the same sentence and referring to the same thing (anvâdeśa) there is the substitution of aś which is anudâtta i. e., gravely accented, when the third case-affix and the rest follow.
Padapāṭha idamaḥ anvādeśe aś anudāttaḥ tṛtīyāādauइदमः अन्वादेशे अश् अनुदात्तः तृतीयाआदौ