  In this paper, we address the problem of determining an envy-free allocation
of indivisible goods among multiple agents. EFX, which stands for envy-free up
to any good, is a well-studied problem that has been shown to exist for
specific scenarios, such as when there are only three agents with MMS
valuations, as demonstrated by Chaudhury et al(2020), and for any number of
agents when there are only two types of valuations as shown by Mahara(2020).
Our contribution is to extend these results by showing that EFX exists for four
agents with three distinct valuations. We further generalize this to show the
existance of EFX allocations for n agents when n-2 of them have identical
valuations.
