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Van Ruysdael.

please solve the mathematical problem

64 - 4 =

Postbus 3064
2601 DB Delft
Nederland
T +31 15 2139315
F +31 15 2139226
https://www.van-ruysdael.com
mail@van-ruysdael.com

Boite Postale 3064
2601 DB Delft | Pays-Bas
T +33 975 184 586 (France)
T +31 15 2139 315 (Pays-Bas)
F +31 15 2139 226
https://www.van-ruysdael.fr
mail@van-ruysdael.fr