The word saha 'together' is compounded with a word ending with the third case-affix and the compound is bahuvrīhī ; provided that, the companion and the person accompanied are equally effected by any action or thing, in the same manner.,
Thus सह पुत्रोणागतः=सपुत्रः ( 6.3.82, सह changed to स ) 'he has come accompanied by his son'. सच्छात्रः 'accompanied by the pupil.' सकर्मकरः 'accompanied by the servant.'
Why do we say 'tulya-yoga'? Witness 'the she-ass carries the whole burden, though there exist her ten sons.'
How do we get the forms like सकर्मकः, सलोमकः, सपक्षकः &c., in which there is no 'tulya-yoga'? It shows that this condition is of limited operation (तुल्य गोगबचनं प्रायिकं).,