>>206 ruby
https://ideone.com/daI0QL
・若干の修正
f = -> a {
w = a.map {|s| s.split('=')}.flatten.uniq.map.with_index.to_h
a.each_with_object([]) {|s, acc|
x, xa, y, ya = s.split('=').map {|k| [k, acc.find {|b| b.include? k}]}.flatten(1)
if xa && ya then xa.concat (acc.delete ya)
elsif xa then xa << y
elsif ya then ya << x
else acc << [x, y]
end
}.map {|a| a.sort_by {|s| w[s]}}.sort_by {|a| w[a[0]]}
}