Suppose that i have four binary buttons i.e. a, b, c, and d
when b is pressed after a it should be displayed "a-b"
Similarly if c is pressed after a then it should be displayed "a-c"
if a pressed after d, should be displayed "d-a"
Suppose that i have four binary buttons i.e. a, b, c, and d
when b is pressed after a it should be displayed "a-b"
Similarly if c is pressed after a then it should be displayed "a-c"
if a pressed after d, should be displayed "d-a"