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f_highest(src, len)=>
    adj_len = len < 1? 1: len
    val = src
    for i=0 to (adj_len-1)
        val := src[i] >= val ? src[i] : val
    return = val

f_lowest(src, len)=>
    adj_len = len < 1? 1: len
    val = src
    for i=0 to (adj_len-1)
        val := src[i] <= val ? src[i] : val
    return = val