Valmiki Ramayana 7.78.10

सो ऽहं वर्षसहस्राणि तपस्त्रीणि महावने ।तप्त्वा सुदुष्करं प्राप्तो ब्रह्मलोकमनुत्तमम्॥

so 'haṃ varṣasahasrāṇi tapastrīṇi mahāvane |taptvā suduṣkaraṃ prāpto brahmalokamanuttamam ||

Our plain-language meaning of this verse is waiting for scholar review.