The affix tasil (tas) is substituted for tas -- pratiyoge pañcamyāstasiḥ [[5.4.44]], apādāne cāhīyaruhoḥ [[5.4.45]] when kim a sarvanāma and bahu follow.,
Thus कुतः, यतः, ततः, or बहुत आगतः ॥ This substitution is for the sake of accent; and for giving it the designation of vibhakti.,