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 26-02-2021 Valdas Bieliauskas:

A.Malyuta, A.Balanyuk, R.Matskyavichyus "Tainstva shashechnykh kvadratov" [k No 309, stranica 84], 2015

Other thematic variants of this Zadacha, please, see below:

Thematic variant: 1. 47-41 38x47 2. 11-22 27x09 3. 40-35 02x13 4. 30x11 16x07 5. 26-12 07x18 6. 29-24 20x38 7. 49-44 38x40 8. 35x15~ 47-20 9. 15x47 [36].