1. dṛk 2. svas and 3. svatavas take the augment num before the affix su (Nominative 1st-Case and Vocative Case singular) in the chandas (Vedas).,
Thus ईदृक्, तादृङ्, यादृङ्, सदृङ्, स्ववान्, स्वतवान् ॥ The श् of ईदृश् (formed by 3.2.60), is elided by 8.2.23; and ङ् substituted for न् by 8.2.62. The lengthening in स्ववान् and स्वतवान् is through 6.4.14.,