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to start with... a divide by two is output of DFF connected to its input through a inverted.
a divide by four is output of DFF connected to its input through a xor with other input being the output of divide by two ... kind of optimized cascase of two divide by two circuits t o give you divide by four.
Search for "clock dividers made easy" in forums.. you'll find a good SNUG paper on this...
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