The keys of the keyboard are connected by vertical pushrods to the escapements. When a key is pressed, the corresponding escapement is actuated, which releases a matrix from the magazine. With one exception, each key corresponds directly to a channel in the standard ("90 channel") magazine. The one exception is the lower-case letter "e": that letter is used so often that the "90 channel" magazine actually has 91 channels, with two channels (the leftmost two) both used for the letter "e". Similarly, the "72 channel" magazine actually has 73 channels, with the leftmost two being used for lower-case "e". Alternate lines release matrices alternately from the two "e" channels in the magazine.