Stock Photo - 29 January 2019, North Rhine-Westphalia, Herne: In the window of an Awo day nursery there is a poster with the inscription ""Warning strike"". In many institutions of the Workers' Welfare Association in North Rhine-Westphalia, employees lay down their work for one day. The trade union Verdi has called for a warning strike. Photo: Caroline Seidel/dpa. - Herne/North Rhine-Westphalia/Germany

Stock Photo: 29 January 2019, North Rhine-Westphalia, Herne: In the window of an Awo day nursery there is a poster with the inscription ""Warning strike"".

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