$//$ functions prototypes

static int x $=1$;

int y $=$ x $*2$;

int main$()\{$

vector vec$1\{1,3,5,7,9,11,13,15\}$;

vector vec$2\{0,2,4,6,8,10\}$;

vec$1.$swap$($vec$2)$;

int$*$ ptr $=$ &vec$2[7]$;

y $=*($ptr $-2)$;

t$1()$;

t$2()$;

t$3()$;

t$3()$;

t$4()$;

return $0$;

$\}$

void t$1()\{$

cout $<<"$x: $"<<$ x $<<"|$ y: $"<<$ y $<<$ endl;

y $-=8$;

x $+=-1$;

$\}$

void t$2()\{$

int& x $=$ y;

x $+=$ ::x$++$;

cout $<<"$x: $"<<$ x $<<"|$ y: $"<<$ y $<<$ endl;

$\}$

void t$3()\{$

int y $=$ x;

static int x $=2$;

cout $<<"$x: $"<<$ x $+1<<"|$ y: $"<<$ y $+2<<$ endl;

x $+=$ y;

$\}$

void t$4()\{$

int y $=$ x $+$ ::x;

int& z $=$ ::y;

z $+=-1$;

cout $<<"$x: $"<<$ x $+$ z $<<"|$ y: $"<<$ y $<<$ endl;

$\}$

This program outputs $5$ lines. What are they?

$1.$

$2.$

$3.$

$4.$

$5.$