Draw the structures (using chair conformations of pyranoses) of the following disaccharides. (a) 4-O-(-D-glucopyranosyl)-D-galactopyranose (b) -D-fructofuranosyl--D-mannopyranoside (c)

Draw the structures (using chair conformations of pyranoses) of the following disaccharides.
(a) 4-O-(α-D-glucopyranosyl)-D-galactopyranose
(b) α-D-fructofuranosyl-β-D-mannopyranoside
(c) 6-O-(β-D-galactopyranosyl)-D-glucopyranose