One or more techniques andor systems are disclosed for matching a target string to a known string. The delivery device comprises a handle that comprises a trigger. A latch on the body engages the restraint to set the restraint in the open position. The output of valve opens a second valve. The current blocking layer may be formed by converting a portion of the upper LED layer into a resistive region. A prediction modeling process based on the assembled feature vector and a prediction model is performed to predict a likelihood of a particular member performing a particular user action on a particular content item.