GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
#example of metabelian computation 1 meta 5 1 1 {a, b} {a^625, b^625, [b, a, b], [b, a, a, a, a] = [b, a]^5} 0 8 14 #set metabelian flag 0 6 #next class 6 6 6 6 6 6 6 6 6 6 6 6 2 META 0