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#!/bin/sh
set -eu
set -x

usage() {
    cat <<'EOF'
difmap: diff two files after mapping them through a shell filter

Examples:

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/**
 * A comparator that follows elements' natural ordering. Useful for comparing
 * numbers: `[8, 9, 10].sort()` is broken, but `[8, 9, 10].sort(natural)` works
 * as expected. Also useful as a "neutral" comparator to give to combinators.
 */
function natural(a, b) {
  if (a > b) return 1;
  if (a < b) return -1;
  return 0;
}

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/**
 * For a finite normal 64-bit float `f`, extracts integers `sgn`,
 * `exponent`, and `mantissa` such that:
 *
 *   - `sgn` is -1 or +1
 *   - `exponent` is between -1023 and 1024, inclusive
 *   - `mantissa` is between 0 and 2^51 - 1, inclusive
 *   - the number given by `f` equals `sgn * 2^exponent * (1 + mantissa / 2^52)`
 *
 * The results are all bigints within the range of safe integers for

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A
A's
AA's
AB's
ABM's
AC's
ACTH's
AI's
AIDS's
AM's

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round   common	rare	epic	legend	godly
1	90	10	0	0	0
2	84	15	1	0	0
3	75	20	5	0	0
4	64	25	10	1	0
5	45	35	15	5	0
6	29	40	20	10	1
7	20	35	25	15	5
8	20	30	25	15	10
9	20	28	25	15	12

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# requires caddyserver/cache-handler module

{
	order cache before rewrite
	cache
	log default {
		output stdout
		# http.handlers.cache logs the entire contents of request
		# bodies at info level(??!)
		exclude http.handlers.cache

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diff --git a/src/art.rs b/src/art.rs
index bcba7e0..1d99457 100644
--- a/src/art.rs
+++ b/src/art.rs
@@ -548,10 +548,84 @@ impl FlowField {
             } => Self::raw_circular(*circularity, *direction, *rotation, traits.version, rng),
         };
         let disturbances = Disturbance::build(traits, rng);
+        ff.dump(&[], "flowfield0_initial.png").unwrap();
+        ff.dump(&disturbances, "flowfield1_disturbances.png")

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diff --git a/src/art.rs b/src/art.rs
index 953bf99..ffec2d1 100644
--- a/src/art.rs
+++ b/src/art.rs
@@ -1431,14 +1431,21 @@ fn draw_ring_dot(pt: &Point, pctx: &mut PaintCtx, rng: &mut Rng) {
         variance_adjust * rescale(num_rings as f64, (1.0, 7.0), (0.022, 0.008))
     };
 
+    // https://personal.sron.nl/~pault/
+    const SEQ: [Rgb; 7] = [

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diff --git a/src/art.rs b/src/art.rs
index 953bf99..f605dfd 100644
--- a/src/art.rs
+++ b/src/art.rs
@@ -521,8 +521,9 @@ impl ColorScheme {
         let splatter_center = (rng.uniform(w(-0.1), w(1.1)), rng.uniform(h(-0.1), h(1.1)));
         let splatter_odds = *rng.wc(splatter_odds_choices);
 
+        let bg_override: ColorKey = color_db.color_key_by_name("Fidenza Brown").unwrap();
         ColorScheme {

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diff --git a/src/art.rs b/src/art.rs
index 97a18d1..cf2b600 100644
--- a/src/art.rs
+++ b/src/art.rs
@@ -1646,12 +1646,30 @@ pub fn draw<F: FnMut(Frame)>(
     let batch_sizes = match config.animate {
         Animation::None => None,
         Animation::Groups => Some(group_sizes.0),
-        Animation::Points { step } => {
-            let step = step as usize;