These are random .. !
you have to use it in this standard order from the right to the left
أ ب ت ث ج ح خ د ذ ر ز س ش ص ض ط ظ ع غ ف ق ك ل م ن ه و ي
or the ABJAD order
أ ب ج د هـ و ز ح ط ي ك ل م ن س ع ف ص ق ر ش ت ث خ ذ ض ظ غ
This are letters not vowels ( as said by youssef ) .. we use TACHKEEL to make them dance and move :P