println( "for1" );
for ( i = 0; i < 6; i++ )
	println( i );
println( "for2" );
for ( i = 0; ; i++ ) {
	if ( i >= 6 )
		break;
	println( i );
	}
println( "for3" );
for ( i = 0; i < 6; ) {
	println( i );
	i++;
	}
println( "for4" );
int i = 0;
for ( ; i < 6; i++ )
	println( i );
