In a bahuvrīhi samāsa the words 1. pād 2. dat and 3. mūrdhan have optionally acute accent (udātta) on the final after dvi and tri,
Thus द्वौ पादावस्य = द्विपा꣡त् or द्विपा꣡त्, त्रिपा꣡द् or त्रिपा꣡द्, द्विद꣡म् or द्विद꣡म्, त्रिद꣡न् or त्रिद꣡न्, द्विमूर्द्धा꣡ or द्वि꣡मूर्धा ॥ The word पाद् is पाद with its अ elided, 5.4.140 दत् is the substitute of दन्त 5.4.141 and मूर्धन् retains its न् not allowing samasanta affix. This also indicates that the samasanta rule is not universal. When the samasanta affix is added, then also the acute is on the final, for the कार्यी is here the Bahuvrihi compound, and this is only a part of it. Thus द्विमूर्द्धः, त्रिमूर्द्धः ॥ Why after द्वि and त्रि ? Observe कल्या꣡णमूर्धा here the first member is middle acute by Phit II. 19 and this accent is retained (VI. 2. I). Why 'पाद् &c'? Observe द्विहस्तम्, त्रिहस्तम् ॥ Why 'Bahuvrihi'? Observe दयोमूर्द्धा = द्विमूर्द्धा ॥,