yes zorflax you BETTER read the title
in all seriousness, i think 4 arms is min arms, one to grab input, one to add the earth and mors, then another assembles the output.
i couldent find a better placement of the assembly arm to have a lower period, and maybe you could merge earth arm and mors arm togetehr? but it dosent seem possible.

if u beat me, then uh it was expected (imagine i win this lol)