Scratch

You will need to do it a long way around, make a variable called log# then do this script

[When f key pressed]
[If <List contains logs> and <List contains flint>]
[] [Set [Log#] to 0]
[] [Repeat until <[Logs] = (item(log#) of list)>
[] [] [Change [log#] by 1]
[] [The repeat block stops here]
[] [Delete (log#) of [list]]
[] [Broadcast [fire]]
[The repeat block ends here]

This is hard to explain, but here goes:

You have 2 variables
Temp.1
Temp.2

you do a code like this:

set Temp.1 to 0
set Temp.2 to 0
repeat (length of (ITEMS LIST))
| change Temp.1 by 1
| if <(Item (Temp.1) of (ITEMS LIST)) = logs>
| | set  Temp.2 to (Temp.1)
|__________________________________________
___________________________________________

At the end of this Temp.2 will hold the positon of logs in the list, so then use

(delete item (Temp.2) of (ITEMS LIST))

and if Temp.2 = 0 then you have none in the list!

But what if logs are in a diffrent place.