Deductive thinking moves from general principles to specific instances. Often, as in a thesis/support essay, prose writers make a general claim and then use specific details and examples to illustrate and back up their point.
In poetry, stanzas are visual groupings of lines. A group of two lines is called a couplet. A three line stanza is called a tercet. A four line stanza is a quatrain, and a five line stanza is a quintet. Two other common lengths are a sestet, six lines; and an octave, eight lines.