Given a list of equations say: eq1 := [diff(kk(r), r) = 0, ff(r)*1/2 = 0], how would i extract just the left hand side of each element ?
[diff(kk(r), r) , ff(r)*1/2 ]

For example when I run a worksheet, if there is an error, maple simply prints the error and moves on to the next step. Is there a way to do that with loops.
The try and catch statements are a bit cumbersome and sometimes you have to predict the kind of error statements you may face.

For example if we have : a*b+c*(d+e)+f+g+h*(k*p+l):
is there a way to write a loop or script so it could give me: [a*b,c*(d+e),f,g,h*(k*p+l)]:

I know maple help has exercies where you can learn from. I was, however, wondering if there is a standard place where people upload their specialized worksheets and maple documents they have used for research once they make it public.

If I have a set S:= [a,b,c],

I want the loop to give me: [[a,b,c],[a+b,c],[a+c,b],[a,b+c],[a+b+c]]