=== A ===
{1,2,3,4,5,6,7,8,9,10}

=== B ===
{1,2,3,4,5,10,9,8,7,6}
{1}

=== C ===
{1,3,5,7,9,11,13,15,17,19}
{2,4,6,8,10,12,14,16,18,20}

=== D ===
{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20}

=== E ===
{1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10}

=== F ===
{1,3,5,7,9,11,13,15,17,19}
{2,4,6,8,10,12,14,16,18,20}

=== G ===
avg = 1.33333

=== H ===
avg = 5.5

=== I ===
{1a1b2c2d3e3}
r1 = 'a1b2c34'
r2 = '1234'
r3 = 'axbc'

=== J ===
s1 = 'tsig'
s2 = 'etn'
M1 = 'testing'
M2 = 'ettsnig'

=== K ===
{10}