oem is like a chart or map. The last two lines of the first stanza have more repetition with the words "mark" and "marks." In line three the speaker marks every face and is noticing the features or characterizing the people he meets. The speaker then in line four "marks" or sees a visible clues. What the speaker sees is "weakness" and "woe." Woe can possibly be seen visually in sadness, sorrow, or grief on the people's faces, but weakness is not really a visual sign. Weakness
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