about I & U

How can you "SM_LE" Without "I 

How can you be "F_NE" without "I

How can you "W_SH" Without "I

 How can you find a "FR_END" without"I

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"I" am very important! But this 'I' can never achieve S_CCESS without 'U' or find L_CK or even have F_N , and that makes 'U' more important than 'I

 Dear friend many thanks for your smart attention.

Have a nice day!