Conti grand Prix 4 season. Which way round?

Unlike the Gatorskins I cant see a direction arrow on these. Does anybody know which way round they go? I cant believe they are multi-directional with a tread pattern. I have thrown away the packaging so not sure if there were any instructions there. Im not used to treaded tyres having mainly used PRO-3s.
Pegoretti
Colnago
Cervelo
Campagnolo
Colnago
Cervelo
Campagnolo
0
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