#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

char*mmap();
#define rd_skip() while(*rp++>=48)
#define rd(v) int v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}

char wbuf[1<<25];
#define WTHI(v) {long _z=v,_n=0,_d=0;while(++_n,_d=_d<<8|0x30|_z%10,_z/=10);*(long*)wp=_d;wp+=_n;}
#define WTLO(v) {long _z=v,_n=8,_d=0;while(_d=_d<<8|0x30|_z%10,_z/=10,--_n);*(long*)wp=_d;wp+=8;}
#define wt(v) WTHI(v)

#define rep(v,e) for(int v=0;v<e;++v)

int b[200001];

main(){
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	char*wp=wbuf;

	rd(n);
	rd_skip();
	int x=0;
	rep(i,n){
		rd(a);
		b[i+1]=x^=a;
	}
	while(*rp){
		rd(l);
		rd(r);
		int y=b[l-1]^b[r];
		wt(y);
		*wp++='\n';
	}
	write(1,wbuf,wp-wbuf);
	_exit(0);
}