def teka_teki_teko(batas):
    """
    Fungsi untuk mencetak angka 1 sampai batas dengan aturan penggantian:
    - Habis dibagi 2 -> "Teka"
    - Habis dibagi 3 -> "Teki"
    - Habis dibagi 5 -> "Teko"
    - Kombinasi sesuai dengan pembagi yang terpenuhi
 
    Args:
        batas (int): Batas atas pencetakan, harus >= 20
 
    Raises:
        ValueError: Jika batas bukan integer atau < 20
    """
    # Validasi input: harus integer dan minimal 20
    if not isinstance(batas, int) or batas < 20:
        raise ValueError("Parameter batas harus berupa integer dan minimal 20")
 
    # Loop dari 1 sampai batas
    for i in range(1, batas + 1):
        output = ""
 
        if i % 2 == 0:
            output += "Teka"
 
        if i % 3 == 0:
            output += "Teki"
 
        if i % 5 == 0:
            output += "Teko"
 
        if output == "":
            output = str(i)
 
        print(output)
 
# Test
print("=== Testing teka_teki_teko(30) ===")
try:
    teka_teki_teko(30)
except Exception as e:
    print(f"Error: {e}")
 
print("\n=== Testing dengan parameter invalid ===")
try:
    teka_teki_teko(15)  # error karena < 20
except Exception as e:
    print(f"Error: {e}")
 
try:
    teka_teki_teko("abc")  # error karena bukan integer
except Exception as e:
    print(f"Error: {e}")
 
try:
    teka_teki_teko(19.5)  # error karena bukan integer
except Exception as e:
    print(f"Error: {e}")
 
print("\n=== Testing dengan batas minimum (20) ===")
try:
    teka_teki_teko(20)
except Exception as e:
    print(f"Error: {e}")
 
print("\n=== Testing dengan batas lebih besar ===")
try:
    teka_teki_teko(25)
except Exception as e:
    print(f"Error: {e}")

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