@startuml 
sprite $envelope_square [48x48/16] {
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0000000FFFFFF2000000000000000000002FFFFFF0000000
0000000FFFFFFE98888888888888888889EFFFFFF0000000
0000000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000000
0000000EFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE0000000
0000000DFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFD0000000
0000000AFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF90000000
00000003FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF30000000
000000008FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF800000000
0000000008FFFFFFFFFFFFFFFFFFFFFFFFFFFF8000000000
00000000003ADEEEEEEEEEEEEEEEEEEEEEEDA30000000000
000000000000000000000000000000000000000000000000
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}


!define FA_ENVELOPE_SQUARE(_alias) ENTITY(rectangle,black,envelope_square,_alias,FA ENVELOPE_SQUARE)
!define FA_ENVELOPE_SQUARE(_alias,_label) ENTITY(rectangle,black,envelope_square,_label,_alias,FA ENVELOPE_SQUARE)
!define FA_ENVELOPE_SQUARE(_alias,_label,_shape) ENTITY(_shape,black,envelope_square,_label,_alias,FA ENVELOPE_SQUARE)
!define FA_ENVELOPE_SQUARE(_alias,_label,_shape,_color) ENTITY(_shape,_color,envelope_square,_label,_alias,FA ENVELOPE_SQUARE)
skinparam folderBackgroundColor<<FA ENVELOPE_SQUARE>> White
@enduml