Arthashastra
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तेषाम् एक योगाश् चत्वारस् त्रि योगाश् च, द्वि योगाः षट् एकश् चतुर् योगः ॥
Of these, the single means as well as the combination of any three means are four; the combinations of any two means are six; and the combination of all the four is one.
english translation
Chapter 7
Verse 76
Verse 78