N    ← 8
Good ← =1⧻◴[⧻◴⟜(∩(⧻◴)⊃+-⇡⧻.)⟜⧻]
⊙◌⍥(⊏⊚≡Good.♭₂⊞⊂⇡:⊙.):⊙.[[]]N
↙2 &p$"_ solutions, two examples are:\n"⊸⧻
≡(&s≡(/(⊂⊂)@|/⊂⍜(⊡|@Q◌):↯:@_)⊸⧻)