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First pair of true leaves type

This refers to the first pair of fully developed, normal leaves. These leaves may be simple or compound.
There are two basic leaf types: simple leaves and compound leaves. Simple leaves have buds or shoots in all forks formed by petioles and the stem.  Compound leaves appear to have neither buds nor shoots in the forks formed by what appear to be the petioles and the stem.  This results from the fact that the apparent leaves are in fact leaflets, and constitute a portion of a compound leaf.  The leaf proper consists of a number of leaflets, and a central stem-like axis to which the leaflets are attached.  Buds and new shoots occur in the fork formed by the compound leaf axis and the true stem.

S31 simple S32 compound, not with 3 leaflets
S33 compound, with 3 leaflets