The nasal may be optionally elided in bhañja before the 3rd person passive of the Aorist in ciṇ (ī).,
Thus अभाजि or अभञ्जि ॥ This is an aprapta vibhasha, and teaches for the first time the elision of न in a certain contingency.,
भञ्जेश् च चिणि
Adhyāya 6 · Pāda 4 · Rule 33