Stepa Stepa Pontus-Kaspia Stepa hutan Stepa Eurasia Tikus ladang stepa Hipotesis Kurgan Gurun Suriah Iklim semi-kering
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Stepa Stepa Pontus-Kaspia Stepa hutan Stepa Eurasia Tikus ladang stepa Hipotesis Kurgan Gurun Suriah Iklim semi-kering