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गुर्वक्षरैस्तु विश्लिष्टैः स नवद्विकलः स्मृतः । द्विर्भावा द्विकलस्यात्र विज्ञेयस्तु चतुष्कलः ॥ ३९॥

When long syllables are separately arranged, it is considered as consisting of two Kalās (Dvikala). The doubling of the Dvikala is then to be understood as forming the Catuṣkala (four Kalās).

english translation

gurvakSaraistu vizliSTaiH sa navadvikalaH smRtaH | dvirbhAvA dvikalasyAtra vijJeyastu catuSkalaH || 39||

hk transliteration by Sanscript