# This function adds truss elements to connect each of the top and bottom vertices according to the pattern of a Warren Truss.

# It also computes and returns a list of the element ids of the "green" elements across the bottom of the bridge.

# Parameters:

# $-$ bridge a SystemElements object from the AnaStruct module $($to which we can add truss elements$).$

# $-$ top$\_$vertices a list of the x$,$y coordinates of the vertices in the top row $($ordered from left to right$)$

# $-$ bottom$\_$vertices a list of the x$,$y coordinates of the vertices in the bottom row $($ordered from left to right$)$

# Return values:

# $-$ a list of the element ids of the "green" elements across the bottom of the bridge.

def connect$\_$warren$\_$truss$\_$vertices$($bridge$,$ top$\_$vertices, bottom$\_$vertices$)$: