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A box is defined via x, y, w and h as

  │ ┌───w───┐
  │ │   ┌───┼──┐
  │ h   │▓▓▓│  │
  │ │   │▓▓▓│  │
  │ o───┼───┘  │
  │     o──────┘

Compute the intersection area between two boxes given as

x1 y1 w1 h1 x2 y2 w2 h2
Compiled from AT&T syntax to x86-64 Linux. Use syscalls to write output.
Top-level programs are supported, args holds ARGV.
ARGV is available via STDIN, joined on NULL. x is a no-op.
ARGV is available via STDIN, joined on NULL.
arguments holds ARGV, print() to output with a newline, write() to output without a newline.
say() is available without any import.
$args to access the arguments.
SELECT arg FROM argv to access the arguments, only the first column of the first result set will be printed, NULL values will be skipped, and the dialect is SQLite.
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