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"bb" means building blocks
"st" means structural forms
"+" means shape transformation
"☆; ☾; ☼; ❃; leaf" mean specific pattern as building block
Symmetrical st: 0 - No symmetry; 1 - Diagonal symmetry; 2 - Plain symmetry; 3 - Matrix squares; 4 - Two-sided continuum; 5 - Four-sided continuum; 6 - Concentric circular symmetry