Analyser: keep only the primary variable of equivalent external variables.
Analyser: keep only the primary variable of equivalent external variables.

cellml/libcellml,hsorby/libcellml,cellml/libcellml,cellml/libcellml,hsorby/libcellml,cellml/libcellml,nickerso/libcellml,nickerso/libcellml,nickerso/libcellml,hsorby/libcellml,nickerso/libcellml,hsorby/libcellml