In Polish consonant clusters, including across a word boundary, the obstruents are all voiced or all voiceless. To determine (based on the spelling of the words) whether a given cluster has voiced or voiceless obstruents, the "last" obstruent in the cluster, excluding "w" or "rz" (but including "ż"), should be examined to see if appears to be voiced or voiceless. The consonants "n, m, ń, r, j, l, ł" do not represent obstruents and so do not affect the voicing of other consonants; they are also usually not subject to devoicing except when surrounded by unvoiced consonants. Some examples follow (click the words to hear them spoken):