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X-ray diffraction of mefenamic acid (a), F'1 (b), physical mixture F'1 (EC : MA 0.25 : 1 ratio) (c), ethylcellulose (d), physical mixture F3 (CAP : MA 1.25 : 1 ratio) (e), F3 (f), cellulose acetate phthalate (g), physical mixture (CAP : EC : 1 0.25 : 0.25 : 1 ratio) (h) and mix (i) formulations
