Creating list (X1-A ,X2-A,X3-A)

Stuck on a creating list in Grasshopper. I need to generate sequential labels list like X1-A, X1-B, X2-A, X2-B, etc.

can any one please help

Graft your Fragment B input (or series output)

thank you sir for quick reply , but when i graft it , the list is increasing


X1-A list.gh (11.1 KB)

Something like this perhaps?

Re-X1-A list.gh (8.9 KB)

Thank you sir