An ordinary Petri net is a bipartite directed graph composedof places, drawn as circles, and transitions, drawn as bars. A formal denitionfollows [3]:Denition 2.1 An ordinary Petri Net (PN) is a 5-tuplePN = (P;T;I ;I + ;M 0) where:1. P = fp 1 ;p 2 ;:::;p n gis a nite and non-empty set of places,2.
The Colors of Geraniums. Geraniums come in a host of colors, from the traditional white, red and pink to the more exotic orange and purple. Geraniums (Pelargonium spp.) are popular garden favorites that can be cultivated throughout all the USDA hardiness zones as annuals or year-round as indoor plants.
1 Geranium essential oil is extracted through steam distillation of the plant's stems and leaves. 2  When made from young, green leaves, geranium oil appears with a lemon scent. 3  However, if extracted from older leaves that have changed their color, the oil will have a strong rose fragrance.eranium oil is often compared to the rose essential oil because they share almost the same therapeutic traits. In fact, geranium is considered the poor man's rose and its oil is often the alternative to the more expensive rose oil.