Two /item commands that accept aliases as arguments and are thus extremely versatile.
E.g. you can use the command like "/item birch plank, 5 red wool and 17 iron ore" and you will receive all 3.
If you add translated aliases to your aliases.sk your players will be able to use those aliases as well.

Please note that an <items> argument accepts enchantments as well, and only the second example command
in this script restricts spawing of enchanted items.