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Leading solution size is 26.
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Test

Code Input and Output

1

Pass

%% x={'A' 'A' 'A'}; assert(howmany(x)==1)

2

Pass

%% x={'A' 'B' 'C'}; assert(howmany(x)==0)

3

Pass

%% x={'A' 'A' 'A' 'A' 'B'}; assert(howmany(x)==1)

4

Pass

%% x={'A' 'A' 'A' 'B' 'B'}; assert(howmany(x)==2)

5

Pass

%% x={'A' 'A' 'A' 'B' 'B' 'B'}; assert(howmany(x)==0)