FLTK sandbox

Verification
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Please demonstrate that you are human, not a spider or robot

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|  ____||____  ||____  | / /  |  _ \ /_ ||  _ \ |__ \ 
| |__       / /     / / / /_  | |_) | | || |_) |   ) |
|  __|     / /     / / | '_ \ |  _ <  | ||  _ <   / / 
| |       / /     / /  | (_) || |_) | | || |_) | / /_ 
|_|      /_/     /_/    \___/ |____/  |_||____/ |____|

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