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 25-02-2021 Valdas Bieliauskas:

A.Malyuta, A.Balanyuk, R.Matskyavichyus "Tainstva shashechnykh kvadratov" [303], 2015

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

Thematic variant: 1. 23-29 42-48 2. 11-07 48x23 3. 29x12 [1, 45];

Thematic variant: 1. 23-29 01-07 2. 29x47 07x16 3. 18-13 16-21 4. 06-17 21x14 5. 47-20 14x25 6. 13-30 [25, 45].