चतुरश्रं कर्माश्वस्य साम्नाह्यम् ॥ कZ_०२.३०.३१ ॥
caturaśraṃ karmāśvasya sāmnāhyam
For a work-horse, ‘harnessed service’ (sāmnāhya) is the four-sided/rectangular duty arrangement (i.e., work in a quadrangular formation/rig).
To ensure uniform practice across units—standard rigs/formations simplify training, inspection, and coordination in transport and support operations.