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Monoid
empty
concat
append

Functor
map: (a -> b) -> f a -> f b

Monad
unit

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SortedMap.iterableFactory should be Seq instead of Iterable
Add implicits for IterableFactory objects
MapView.values is not lazy

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# Version 1. Unsafe C Style
$cp = [System.CodeDom.Compiler.CompilerParameters]::new()
$cp.CompilerOptions = '/unsafe'
$Display = Add-Type -TypeDefinition @'
using System;
using System.Runtime.InteropServices; 
public unsafe class Display 
{
  [DllImport("User32.dll")]
  public static extern bool EnumDisplaySettings(

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ffmpeg -i input.mp4 -vf mpdecimate,setpts=N/FRAME_RATE/TB out.mp4

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def permutationRecursion(a: List[Int]) = {
  import scala.collection.mutable
  val results = mutable.ListBuffer[List[Int]]()
  
  def p(curr: List[Int], remaining: List[Int]): Unit = {
     if (remaining.isEmpty) {
       results += curr
     }
     else {
      for (i <- remaining) {

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#!/bin/sh

# Pump
sudo pmset -a disablesleep 1
sudo pmset -a sleep 0
caffeinate -di

#Sleep
kill `ps -ef | grep caffeinate | grep -v grep | awk '{print $3}'`
sudo pmset -a disablesleep 0

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In /etc/ssh/sshd_config

IPQoS cs0 cs0

In /etc/fstab

UUID=XXXX   /media/pi/Data  auto    rw,user,auto 0       0

```
sudo setfacl -b /media/pi

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EXECFILE="$(readlink "$0" || echo "$0")"
EXECPATH="$( cd -- "$(dirname "$EXECFILE")" >/dev/null 2>&1 ; pwd -P )"
cd "$EXECPATH"

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inside: 

~/Library/Preferences/com.apple.LaunchServices/com.apple.launchservices.secure.plist

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awk 'NR==FNR{a[$0]=1;next}!a[$0]' B A
# or better memory usage:
awk 'NR==FNR{a[$0];next} !($0 in a)' B A

grep -Fvx -f B.txt A.txt