These elements of word architecture are the typical building blocks in Classical Sanskrit, but in Vedic Sanskrit these elements fluctuate and are unclear. For example, in the "Rigveda" preverbs regularly occur in tmesis, states Jamison, which means they are "separated from the finite verb". This indecisiveness is likely linked to Vedic Sanskrit's attempt to incorporate accent. With nonfinite forms of the verb and with nominal derivatives thereof, states Jamison, "preverbs show much clearer univerbation in Vedic, both by position and by accent, and by Classical Sanskrit, tmesis is no longer possible even with finite forms".