∅, {A}, {B}, {C}, {D}, {A, B}, {A, C}, {A, D}, {B, C}, {B, D}, {C, D}, {A, B, C}, {A, B, D},{A, C, D}, {B, C, D}, {A, B, C, D}

SOLUTION MANUAL FOR DISCRETE MATHEMATICS 7TH EDITION BY JOHNSONBAUGH

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84. ∅, {a}, {b}, {c}, {d}, {a, b}, {a, c}, {a, d}, {b, c}, {b, d}, {c, d}, {a, b, c}, {a, b, d},

{a, c, d}, {b, c, d}, {a, b, c, d}. All except {a, b, c, d} are proper subsets.