$(5\%)$ Suppose an ISP owns the block of addresses of the form $128\mathrm{.}119\mathrm{.}40\mathrm{.}64/25.$

Suppose it wants to create four subnets from this block, with each block having

the same number of IP addresses. What are the prefixes $($of form a$.$b$.$c$.$d$/$x$)$ for the

four subnets?