Can you write a program to get the Highest Common Factor (HCF) of fractions.

Can you write a program to get the Highest Common Factor (HCF) of fractions.
{ {4 / 5}, {5 / 6}, {14 / 15} } =>1 / 30
{ {3 / 13}, {6 / 7}, {18 / 7} } =>3 / 91
{ {14 / 39}, {35 / 9}, {28 / 3}, {91 / 11} } =>7 / 1287
{ {57 / 10}, {95 / 12}, {133 / 90} } =>19 / 180
{17 / 47} =>17 / 47
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