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#double line symbol #strong border

⛔️➖⛔️

#boundary line #limit line #do not cross #strong border #dividing line

🔲➕💪

#thick border #strong border #heavy frame #bold outline #thick outline #UI border #geometric border

🖼️💪

#thick border #strong border #heavy frame #thick outline #substantial border #frame strength

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#dicke linie #demarcation #thick boundary #strong border #drawing a line