a word line decoder comprises a plurality of driver circuits , a plurality of word lines provided at respective outputs of the driver circuits , and a plurality of primary input lines coupled to the driver circuits and oriented in a first direction . the word line decoder also comprises a plurality of secondary input lines coupled to the driver circuits and oriented in the first direction . the word line decoder also comprises a local decode line coupled to each of the primary input lines . the word line decoder also comprises a decode line coupled to the local decode line and oriented in the first direction . a cluster decode line is coupled to the decode line . the word line decoder is configured to select at least one of the word lines based on signals provided by the cluster decode line and the secondary input lines .