They were not designed for a combined use: they just happened to employ a similar engineering principle that was peculiar to the locality. Bichhwa was originally an improvised , low-class weapon: a cow horn with a longitudinal slit in the wider end. It always had a shady reputation:-)
The “paired” weapons usually included a long -bladed one in the dominant arm and a short-bladed one in the other one ( recall european Maine Gauche) that served as an analog of a shield and was very useful in close contact. Two short ones make very little practical sense.
IMHO.
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