In Jain tradition, there is no universally fixed bija mantra that must be placed before the Visahara Phulinga Mantra. The commonly accepted and safe Jain practice is to begin with the Navkar Mantra, and then recite the Uvasaggaharam Sutra, in which the line “visahara-phullinga-mantam” appears as part of the text itself. ( jainknowledge.com)

So, from a Jain-scriptural standpoint, the proper opening is generally:

1. Navkar Mantra
2. Uvasaggaharam Sutra / Visahara Phulinga line

If someone uses an extra seed syllable before it, that is tradition-specific and not a standard Jain canonical rule. ( jainknowledge.com)

A simple and respectful Jain recitation would be: Navkar Mantra → Uvasaggaharam Sutra. ( jainknowledge.com)