@ecterrab But this method requires that we know the commutator beforehand.

If the commutator set is longwinded at a higher weight, it is hard to compute it. Fortunately we can generate the commutator using Lyndon basis as said in page 102 of https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.39.9573&rep=rep1&type=pdf

Let's say we have the following commutator basis at wight 6.

{[e[0], [e[0], [e[0], [e[0], [e[0], e[1]]]]]], [e[1], [e[0], [e[0], \
[e[0], [e[0], e[1]]]]]], [e[1], [e[1], [e[0], [e[0], [e[0], \
e[1]]]]]], [e[1], [e[1], [e[1], [e[0], [e[0], e[1]]]]]], [e[1], \
[e[1], [e[1], [e[1], [e[0], e[1]]]]]], [[e[0], e[1]], [e[0], [e[0], \
[e[0], e[1]]]]], [[e[0], e[1]], [e[1], [e[0], [e[0], e[1]]]]], \
[[e[0], e[1]], [e[1], [e[1], [e[0], e[1]]]]], [[e[0], [e[0], e[1]]], \
[e[1], [e[0], e[1]]]]}

How could I quickly (automatically) convert them to forms like (5) you given in the answer? I manually input the %Commutator=expand@... from weight 2 to 5 in Drinfieldstuff_display.mw (the process takes long)

@ecterrab That's a very good solution. Thanks

@ecterrab Thanks for the comment. I have modified it with an attached file.

I have changed the equation. (Smaller)

But it reaches stacklimit

I modified stack data in linux: ulimit -S -s 655360000

And also the corresponding

kernelopts(stacklimit=655360000);

It still reported :

Execution stopped: Stack limit reached.

@Carl Love 

It seems that it can. Here is the output:

~/maple2020/bin/maple
    |\^/|     Maple 2020 (X86 64 LINUX)
._|\|   |/|_. Copyright (c) Maplesoft, a division of Waterloo Maple Inc. 2020
 \  MAPLE  /  All rights reserved. Maple is a trademark of
 <____ ____>  Waterloo Maple Inc.
      |       Type ? for help.
> kernelopts(datalimit);                                                                                                                                                                                  
                                                                                                 infinity

>                                                                                                

@Thomas Richard Hi, I made 375Gb swap and it still report this problem.