Solved Multiple drops with different % in 1 condition?

[Nextopi]

I know for 1 drop is like this

            if player's tool is a sword:
                chance of 5%
                drop 1 stone

but how do it do it for multiple drops? like, you have 100% chance to drop stone and 50% to drop dirt, after X killing a zombie, so the player has the chance to get both drops at once.

 

[TPGamesNL]

chance of 100%:
    drop 1 stone
chance of 50%:
    drop 1 dirt