Someoneholds the following portfolio of futures positions today:

Long 10 MARCH 2019 WTI Futures on NYMEX

Short 10 JULY 2019 WTI futures on NYMEX

Long 5 JUNE NG futures on NYMEX

Short 5 AUG NG futures on NYMEX

Long 15 MARCH WHEAT futures on CBT

Short 15 MAY WHEAT futures on CBT

This portfolio of futures was established two months ago.

They closes all positions today.

Describe the exact actions that one must take if they wishe to close all their futures positions today.