There are seven columns and six rows.
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four segments are needed
Well the base has four corners (square), and these all connect to a vertex at the top (pyramid). Therefore, there are 5 corners on a square pyramid.
Assuming that each bridge can connect at most two vertices, you will need at least 4 bridges to connect seven vertices. Conversely, two bridges will connect at most four vertices.
Four. Four. Four. Four.
you join the dots without lifting your pen.