गोभिल गृह्यसूत्रम् (सामवेद कौथुम-राणायनीय शाखा - मुकुन्द शर्मा सटीक)

(द् + ग) or द् with virama?
Look at: आ ङ् प ू र् व ा द् ग म े स ्
Wait, it has a horizontal-ish stroke below द्, which in some fonts is just virama! But does it look like 'दू'? In many Nirnaya Sagar / Chowkhamba fonts, virama under द curves down-right like a little tail, often transcribed as द् or दू. But grammatically it is आङ्पूर्वाद् गमेः (ablative of आङ्पूर्व + गम्). It's clearly a virama on द! Wait, look at:
आङ्पूर्वाद्गमेस्ताच्छीलिकस्तृन्प्रत्ययः
Let's write आङ्पूर्वाद्गमेस्ताच्छीलिकस्तृन्प्रत्ययः (or if it's printed as दू, wait, is there an actual standalone ू? No, it's attached to द: द्). It is definitely द्गमेस्!
Wait, look at Note 2:
अत्राङ्पूर्वाद्गमेलिङर्थे
Same ligature द्ग!

Let's check L2:
न्त्रा' आगमनशीलेन(१) ब्रह्मचारिणा । वयं 'समगन्महि' सङ्गच्छेमहि(२) ।
Wait, look at the beginning of L2:
न्त्रा' आगमनशीलेन(१)
Before न्त्रा, is there something?
It starts with: न्त्रा' आगमनशीलेन(१)