Margin property simplification

suggest change
p {
    margin:1px;                /* 1px margin in all directions */
    /*equals to:*/
    margin:1px 1px;
    /*equals to:*/
    margin:1px 1px 1px;
    /*equals to:*/
    margin:1px 1px 1px 1px;

Another exapmle:

    margin:10px 15px;        /* 10px margin-top & bottom And 15px margin-right & left*/
    /*equals to:*/
    margin:10px 15px 10px 15px;
    /*equals to:*/
    margin:10px 15px 10px;
    /* margin left will be calculated from the margin right value (=15px) */

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