Mathematics
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    29+13= 91-70= 97-80= 94-15= 99-44= 55-55= 63-39= 69-46= 29+18= 24+24= 82-21= 98-48=
    61-47= 98-53= 29+15= 45+13= 13+30= 34+30= 68+10= 46+22= 70-41=
    20-19= 70-36= 75-58= 68-29= 70-69= 72-43= 62-41= 81+13= 87-58=
     62-57= 62-17= 30-16=
    45+13= 33+20= 98-93= 82-24= 59-44= 74-24= 35+26= 41+14= 72+11= 62-57= 62-17= 30-16=
    84-78= 92-16= 91-28= 78-22= 64-34= 82-5= 99-10= 94-73= 42-39=
    55-42= 70-24= 65-21= 77-73= 96-94= 56-31= 46-21= 51-19= 72+13=
     98-75= 59-36= 53-28=
    65+23= 81-55= 88-69= 64+15= 85-43= 47+17= 84-52= 64-28= 62-43= 98-75= 59-36= 53-28=
    39+22= 74-15= 54-35= 28+11= 45-34= 78-63= 61-57= 84-26= 61-53=
    20+13= 57+43= 56+12= 28-21= 71+29= 77-30= 89-63= 29-14= 84-47=
    50-28= 81-31= 75+17=
    80-43= 35-19= 76-33= 89-38= 86-76= 74-21= 86-43= 73-38= 80-55=
    18-14= 99-69= 23-15= 96-90= 48-20= 62-36= 82-72= 13+14= 80-31=
    67-47= 89-38= 61-51= 17-11= 95-87= 74-26= 52-13= 54-24= 39-13=
    69-23= 77-35= 84-20=
    99-72= 97-96= 81-65= 68-32= 96-2= 88-40= 78-10= 88-26= 62-61=
    95-25= 34-26= 76-59= 18-15= 41-11= 49-31= 45-40= 70-11= 85-47=
    88-30= 84-29= 82-20= 68-27= 39+21= 19-12= 40-27= 57-34= 88-72=
    44-16= 26-10= 87-64=

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