Well, the default modus you have is called a 'stack' modus. You can only pull out the item that was put into your sylladex most recently. You can also use an Array modus, which will allow you to pull out anything at anytime you like, without fuss. I have that as a back-up modus if I feel the situation is too important for shenanigans.

[It's a rather complicated one! Darkleer likes to challenge himself, after all, and his main hobbies do include robotics...]

I get a few tries to get the answer correct. If I don't, after a few tries, my modus locks me out from getting that particular item. All the more reason to get it right, hm?