function write_BrtBeginMergeCells(cnt, o) {
	if(o == null) o = new_buf(4);
	o.write_shift(4, cnt);
	return o;
}
function write_BrtBeginMergeCells(cnt, o) {
	if(o == null) o = new_buf(4);
	o.write_shift(4, cnt);
	return o;
}
function write_BrtBeginMergeCells ( cnt , o ) { if ( o == null ) o = new_buf ( 4 ) ; o . write_shift ( 4 , cnt ) ; return o ; }
/* [MS-XLSB] 2.4.107 BrtBeginMergeCells
/ * [ MS - XLSB ] 2 . 4 . 107 BrtBeginMergeCells
Helper function to write the begin of merge cells