If the logical timestamps of two consecutive events within a process $p$ have the

values $Lp(\frac{e}{\frac{?}{?}}(\frac{i}{\frac{?}{?}}))=10$ and $Lp(\frac{e}{\frac{?}{?}}(\frac{i+1}{\frac{?}{?}}))=15,$ then

$\frac{e}{\frac{?}{?}}(\frac{i}{\frac{?}{?}})$ must be a receiving event

$\frac{e}{\frac{?}{?}}(\frac{{?}_i}{\frac{?}{?}})$ must be a sending event

$\frac{e}{\frac{?}{?}}(\frac{i+1}{\frac{?}{?}})$ must be a receiving event

$\frac{e}{\frac{?}{?}}(\frac{i+1}{\frac{?}{?}})$ must be a sending event