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3X4 Keypad

i connect row1->p0.0
row2->p0.1
row3->p0.2
row4->p0.3
colum1 ---->p0.4
column2---->p0.5
column3----->p0.5
i pull up all columns with 4.7k to vcc
this keypad is telephone keypad
please help me to write a program for this
best regards
javad majd