@Carl Love Respected sir,

With your kind help can I get a program only for hypercube graphs. 

Kind help I am really sorry for any disturbance caused. 

I apologize kind help

@Carl Love Please answer was satisfactory and great of your help sir

@Carl Love Graph H

  Graph G

I want to display G cartesian H in legacy form and this time I want the relabel the vertices as (1,1) not 1:1 etc that 

(a,b) not a:b as it comes 

and i want the bipartite result to be as much neat as possible as the vertices to be neatly visible i know edges a too much 

only the vertices should be in neat like (a,b) not a:b

kind help if anyone 

I apologize for the inconvience caused

@vv

But if I give legacy in DrawGraph

It changes the way picture is displayed it is not straight like above 

I want those blue edges for all and yellow filled vertices

And rectangle shaped vertices too

AND GRAPH SHOULD NOT ROTATE ITSELF IT SHOULD BE STRAIGHT LIKE ABOVE GRAPH 

@Kitonum I am working with 2020 I need like combination like 50 say and "it can even more scale" and I based on my laptop configuration being a lower middle class man I can't afford to extend my RAM too it also depends on mother's board configuration etc

And see program it more of all not sequential

@acer Thank you very much  I am also trying for a similar one for combination will tell hope can get help if i cannot by chance

@dharr but their is a issue their then data is big it will give stack overflow permute stores everthing and then return that is what i dont want

@nm I am trying to enumerate the permutations but dont want the in built in function as i want to check the properties of the permutation at each if i get a property i stop. 

so i dont want the entire permuation in a variable in memory i want simple exract only one at a time. and keep droping them after use.

i want i try in above code

Input is an array one dimension or a list say and ouput is permute each one time as u get one drop it the permuation should not be stored in memory as a bunch

From those i need to pick 100 at a time. i need to do without built in command permutation and combination.

permution of 20 elements and combination same some. i will stop when my desired condition is k