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#include <LiquidCrystal.h>
#include <Keypad.h>
LiquidCrystal lcd(0, 1, 5, 4, 3, 2);
const byte ROWS = 4;
const byte COLS = 4;
char keys [ROWS] [COLS] = {
{'1', '2', '3', '+'},
{'4', '5', '6', '-'},
#include <LiquidCrystal.h>
#include <Keypad.h>
LiquidCrystal lcd(0, 1, 5, 4, 3, 2);
const byte ROWS = 4;
const byte COLS = 4;
char keys [ROWS] [COLS] = {
{'1', '2', '3', '+'},
{'4', '5', '6', '-'},