To store mappings of fancy pair characters . For example 6 is paired with 9 and 9 is paired with 6.
fp = { } NEW_LINE fp [ '0' ] = '0' NEW_LINE fp [ '1' ] = '1' NEW_LINE fp [ '6' ] = '9' NEW_LINE fp [ '8' ] = '8' NEW_LINE fp [ '9' ] = '6' NEW_LINE